[Git][ghc/ghc][wip/sjakobi/cmmsink-touch] CmmSink: don't treat MO_Touch as clobbering all memory
by Simon Jakobi (＠sjakobi) 07 Sep '26
by Simon Jakobi (＠sjakobi) 07 Sep '26
07 Sep '26
Simon Jakobi pushed to branch wip/sjakobi/cmmsink-touch at Glasgow Haskell Compiler / GHC
Commits:
1394f191 by Simon Jakobi at 2026-09-07T14:25:58+02:00
CmmSink: don't treat MO_Touch as clobbering all memory
Rule (C3)(c) of the sinking pass blocked loads from sinking past any
CmmUnsafeForeignCall, including touch#, which emits no code. In the
read-then-touch pattern of bytestring's unsafe indexing this left a
movb + movzbl where one movzbl from memory suffices.
Add callishMachOpClobbersMemory to classify callish ops. For now only
MO_Touch and MO_Prefetch_Data count as non-clobbering.
Sinking a load past touch# is safe. The hazard in #18040 is a
Core-level read delayed past a GC safe point. The sinking pass works
within a block, and any call that might contain a safe point still
blocks it. See Note [Foreign calls clobber heap].
Also let the Cmm parser accept prim %touch(...), needed by the test.
Fixes #27782.
Assisted-by: Claude Fable 5.1
- - - - -
6 changed files:
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Parser.y
- compiler/GHC/Cmm/Sink.hs
- + testsuite/tests/codeGen/should_gen_asm/T27782.asm
- + testsuite/tests/codeGen/should_gen_asm/T27782.cmm
- testsuite/tests/codeGen/should_gen_asm/all.T
Changes:
=====================================
compiler/GHC/Cmm/MachOp.hs
=====================================
@@ -18,6 +18,7 @@ module GHC.Cmm.MachOp
-- CallishMachOp
, CallishMachOp(..), callishMachOpHints
+ , callishMachOpClobbersMemory
, pprCallishMachOp
, machOpMemcpyishAlign
, callishMachOpArgTys
@@ -876,6 +877,18 @@ callishMachOpHints op = case op of
_ -> ([],[])
-- empty lists indicate NoHint
+-- | May this operation write to memory, or otherwise act as a memory
+-- barrier? When in doubt, answer 'True'.
+--
+-- Used by the sinking pass to decide whether a memory read may be moved
+-- past a call of this operation; see Note [Foreign calls clobber heap]
+-- in GHC.Cmm.Sink.
+callishMachOpClobbersMemory :: CallishMachOp -> Bool
+callishMachOpClobbersMemory op = case op of
+ MO_Touch -> False -- pure liveness marker, no instructions
+ MO_Prefetch_Data _ -> False -- reads memory, writes nothing
+ _ -> True
+
-- | The alignment of a 'memcpy'-ish operation.
machOpMemcpyishAlign :: CallishMachOp -> Maybe Int
machOpMemcpyishAlign op = case op of
=====================================
compiler/GHC/Cmm/Parser.y
=====================================
@@ -1203,6 +1203,8 @@ callishMachOps platform = listToUFM $
( "prefetch2", (MO_Prefetch_Data 2,)),
( "prefetch3", (MO_Prefetch_Data 3,)),
+ ( "touch", (MO_Touch,) ),
+
( "bswap16", (MO_BSwap W16,) ),
( "bswap32", (MO_BSwap W32,) ),
( "bswap64", (MO_BSwap W64,) )
=====================================
compiler/GHC/Cmm/Sink.hs
=====================================
@@ -719,7 +719,10 @@ conflicts platform assig@(r, rhs, addr) node
= True
-- (c) foreign calls clobber heap: see Note [Foreign calls clobber heap]
- | CmmUnsafeForeignCall{} <- node, memConflicts addr AnyMem = True
+ | CmmUnsafeForeignCall target _ _ <- node
+ , foreignTargetClobbersMemory target
+ , memConflicts addr AnyMem
+ = True
-- (d) native calls clobber any memory
| CmmCall{} <- node, memConflicts addr AnyMem = True
@@ -732,6 +735,12 @@ conflicts platform assig@(r, rhs, addr) node
| otherwise = False
+-- | May this foreign-call target write to memory, or otherwise act as a
+-- memory barrier? See Note [Foreign calls clobber heap].
+foreignTargetClobbersMemory :: ForeignTarget -> Bool
+foreignTargetClobbersMemory (PrimTarget op) = callishMachOpClobbersMemory op
+foreignTargetClobbersMemory (ForeignTarget {}) = True
+
{- Note [Inlining foldRegsDefd]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foldRegsDefd is, after optimization, *not* a small function so
@@ -874,6 +883,16 @@ data AbsMem
-- `suspendThread` releases the capability used by the thread, hence we mustn't
-- float accesses to heap, stack or virtual global registers stored in the
-- capability (e.g. with unregisterised build, see #19237).
+--
+-- Conversely, a few CallishMachOps neither write memory nor imply a
+-- barrier, and needn't block sinking ('callishMachOpClobbersMemory' in
+-- GHC.Cmm.MachOp classifies them):
+--
+-- * MO_Touch is a pure liveness marker: no backend emits any code for it.
+-- Sinking is intra-block, so the Core-level touch# reordering hazard
+-- of #18040 does not arise.
+--
+-- * MO_Prefetch_Data reads memory but writes nothing.
bothMems :: AbsMem -> AbsMem -> AbsMem
=====================================
testsuite/tests/codeGen/should_gen_asm/T27782.asm
=====================================
@@ -0,0 +1,7 @@
+loadTouch:
+ movzbl
+ jmp
+loadPrefetch:
+ prefetchnta
+ movzbl
+ jmp
=====================================
testsuite/tests/codeGen/should_gen_asm/T27782.cmm
=====================================
@@ -0,0 +1,18 @@
+#include "Cmm.h"
+
+// A load must sink past touch# and prefetch, which don't clobber memory,
+// so that it can be folded into the instruction that uses it.
+
+loadTouch (W_ p, P_ o) {
+ bits8 b;
+ b = bits8[p];
+ prim %touch(o);
+ return (%zx64(b));
+}
+
+loadPrefetch (W_ p, W_ q) {
+ bits8 b;
+ b = bits8[p];
+ prim %prefetch0(q);
+ return (%zx64(b));
+}
=====================================
testsuite/tests/codeGen/should_gen_asm/all.T
=====================================
@@ -27,6 +27,7 @@ test('T25233', [unless(arch('x86_64'), skip),
when(unregisterised(), skip)], compile_grep_asm, ['hs', True, '-O'])
test('T25233b', [unless(arch('x86_64'), skip),
when(unregisterised(), skip)], compile_grep_asm, ['cmm', True, ''])
+test('T27782', is_amd64_codegen, compile_cmp_asm, ['cmm', ''])
is_aarch64_codegen = [
unless(arch('aarch64'), skip),
when(unregisterised(), skip),
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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 2 commits: rts: fix ctoi_tuple_spill_words getting out of sync
by Marge Bot (＠marge-bot) 07 Sep '26
by Marge Bot (＠marge-bot) 07 Sep '26
07 Sep '26
Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC
Commits:
c68cb63d by Luite Stegeman at 2026-09-07T08:02:47-04:00
rts: fix ctoi_tuple_spill_words getting out of sync
Fix a few places that were not updating ctoi_tuple_spill_words
correctly, leading to corruption/crashes when dealing with large
unboxed tuples in bytecode:
- captureContinuationAndAbort
- findRetryFrameHelper/findAtomicallyFrameHelper
- interpretBCO bci_BRK_FUN
fixes #27633
- - - - -
48c23c94 by Simon Jakobi at 2026-09-07T08:02:47-04:00
Hadrian: don't capture the testsuite driver's output (#27780)
a6061455d54 switched the Testsuite RunTest case from Shake's cmd to the
cmd' wrapper. cmd' always captures stdout and stderr, and since the
caller asks for Exit, it returns without dumping what it captured. As a
result the testsuite output no longer appears in CI job logs: failures,
performance metrics and the summary were lost with the job.
Use cmdExe, the uncaptured cmd, as the other plain-cmd sites in that
commit do.
Fixes #27780.
Assisted-by: Claude Fable 5.1
- - - - -
15 changed files:
- hadrian/src/Builder.hs
- rts/Continuation.c
- rts/Interpreter.c
- rts/Schedule.c
- + testsuite/tests/bytecode/T27633/Obj.hs
- + testsuite/tests/bytecode/T27633/T27633a.hs
- + testsuite/tests/bytecode/T27633/T27633a.stdout
- + testsuite/tests/bytecode/T27633/T27633b.hs
- + testsuite/tests/bytecode/T27633/T27633b.stdout
- + testsuite/tests/bytecode/T27633/all.T
- + testsuite/tests/ghci.debugger/scripts/T27633c.hs
- + testsuite/tests/ghci.debugger/scripts/T27633c.script
- + testsuite/tests/ghci.debugger/scripts/T27633c.stdout
- + testsuite/tests/ghci.debugger/scripts/T27633c_obj.hs
- testsuite/tests/ghci.debugger/scripts/all.T
Changes:
=====================================
hadrian/src/Builder.hs
=====================================
@@ -387,7 +387,7 @@ instance H.Builder Builder where
-- RunTest produces a very large amount of (colorised) output;
-- Don't attempt to capture it.
Testsuite RunTest -> do
- Exit code <- cmd' prog buildArgs buildOptions
+ Exit code <- cmdExe prog buildArgs buildOptions
when (code /= ExitSuccess) $ do
fail "tests failed"
=====================================
rts/Continuation.c
=====================================
@@ -392,6 +392,10 @@ StgClosure *captureContinuationAndAbort(Capability *cap, StgTSO *tso, StgPromptT
const StgInfoTable *apply_mask_frame = NULL;
StgWord mask_frame_offset = 0;
+ // see Note [GHCi unboxed tuples stack spills]
+ bool seen_ctoi_tuple_frame = false;
+ StgWord ctoi_tuple_spill_words = 0;
+
/* --- Phase 1: Find the matching prompt frame ---------------------------- */
IF_DEBUG(continuation,
@@ -459,7 +463,8 @@ StgClosure *captureContinuationAndAbort(Capability *cap, StgTSO *tso, StgPromptT
// see Note [GHCi unboxed tuples stack spills]
if (info_ptr == &stg_ctoi_t_info) {
- tso->ctoi_tuple_spill_words = frame[CTOI_OLD_TUPLE_SPILL_WORDS_OFFSET];
+ seen_ctoi_tuple_frame = true;
+ ctoi_tuple_spill_words = frame[CTOI_OLD_TUPLE_SPILL_WORDS_OFFSET];
}
// Advance to the next frame.
@@ -475,6 +480,11 @@ StgClosure *captureContinuationAndAbort(Capability *cap, StgTSO *tso, StgPromptT
dirty_TSO(cap, tso);
dirty_STACK(cap, stack);
+ // see Note [GHCi unboxed tuples stack spills] in StgMiscClosures.cmm
+ if (seen_ctoi_tuple_frame) {
+ tso->ctoi_tuple_spill_words = ctoi_tuple_spill_words;
+ }
+
StgContinuation *cont = (StgContinuation *)allocate(cap, CONTINUATION_sizeW(total_words));
SET_HDR(cont, &stg_CONTINUATION_info, stack->header.prof.ccs);
cont->apply_mask_frame = apply_mask_frame;
=====================================
rts/Interpreter.c
=====================================
@@ -1982,6 +1982,20 @@ run_BCO:
for (i = 0; i < size_words; i++) {
new_aps->payload[i] = (StgClosure *)ReadSpW(i);
}
+
+ /* The stg_ctoi_t frame we copied is entered again when
+ execution resumes, but tso->ctoi_tuple_spill_words
+ holds the enclosing frame's count: it was restored
+ from old_spill when this case continuation was entered
+ (bci_RETURN_T). Put back the count belonging to this
+ frame, so the invariant holds while the thread sits at
+ the breakpoint.
+
+ See Note [GHCi unboxed tuples stack spills] */
+ if (ReadSpW(size_returned_frame) == (W_)&stg_ctoi_t_info) {
+ cap->r.rCurrentTSO->ctoi_tuple_spill_words =
+ ReadSpW(size_returned_frame + CTOI_TUPLE_INFO_OFFSET) >> 24;
+ }
}
else {
=====================================
rts/Schedule.c
=====================================
@@ -3271,6 +3271,10 @@ findRetryFrameHelper (Capability *cap, StgTSO *tso)
default:
ASSERT(info->i.type != CATCH_FRAME);
ASSERT(info->i.type != STOP_FRAME);
+ // see Note [GHCi unboxed tuples stack spills] in StgMiscClosures.cmm
+ if (*p == (StgWord)&stg_ctoi_t_info) {
+ tso->ctoi_tuple_spill_words = p[CTOI_OLD_TUPLE_SPILL_WORDS_OFFSET]; // restore old_spill
+ }
p = next;
continue;
}
@@ -3332,6 +3336,10 @@ findAtomicallyFrameHelper (Capability *cap, StgTSO *tso)
default:
ASSERT(info->i.type != CATCH_FRAME);
ASSERT(info->i.type != STOP_FRAME);
+ // see Note [GHCi unboxed tuples stack spills] in StgMiscClosures.cmm
+ if (*p == (StgWord)&stg_ctoi_t_info) {
+ tso->ctoi_tuple_spill_words = p[CTOI_OLD_TUPLE_SPILL_WORDS_OFFSET]; // restore old_spill
+ }
p = next;
continue;
}
=====================================
testsuite/tests/bytecode/T27633/Obj.hs
=====================================
@@ -0,0 +1,13 @@
+{-# OPTIONS_GHC -fobject-code #-}
+{-# LANGUAGE UnboxedTuples, MagicHash #-}
+module Obj where
+
+import GHC.Exts
+
+-- Compiled to object code; returns a large unboxed tuple, so the return
+-- into an interpreted caller goes through the native stg_ctoi_t entry code,
+-- which reads tso->ctoi_tuple_spill_words.
+-- See Note [GHCi unboxed tuples stack spills] in rts/StgMiscClosures.cmm.
+mkT :: State# RealWorld -> (# State# RealWorld, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int# #)
+mkT s = (# s, 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, 10#, 11#, 12#, 13#, 14#, 15#, 16#, 17#, 18#, 19#, 20#, 21#, 22#, 23#, 24# #)
+{-# NOINLINE mkT #-}
=====================================
testsuite/tests/bytecode/T27633/T27633a.hs
=====================================
@@ -0,0 +1,34 @@
+{-# LANGUAGE UnboxedTuples, MagicHash #-}
+{-# OPTIONS_GHC -fbyte-code #-}
+
+-- Regression test for #27633 (bug 1): a failed control0# capture must not
+-- clobber tso->ctoi_tuple_spill_words while a generic stg_ctoi_t frame is
+-- still live on the stack.
+-- See Note [GHCi unboxed tuples stack spills] in rts/StgMiscClosures.cmm.
+
+module Main where
+
+import Control.Exception
+import GHC.Exts
+import GHC.IO (IO(..))
+import Obj
+
+unIO :: IO a -> State# RealWorld -> (# State# RealWorld, a #)
+unIO (IO f) = f
+
+-- control0# with a tag that has no matching prompt anywhere on the stack;
+-- the resulting exception is caught right here, above the stg_ctoi_t frame,
+-- so the unwind stops before reaching the frame.
+failing :: IO ()
+failing = IO (\s0 -> case newPromptTag# s0 of
+ (# s1, tag #) -> control0# tag (\_ s -> (# s, () #)) s1)
+ `catch` \(SomeException _) -> return ()
+
+scrut :: State# RealWorld -> (# State# RealWorld, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int# #)
+scrut s0 = case unIO failing s0 of (# s1, _ #) -> mkT s1
+{-# NOINLINE scrut #-}
+
+main :: IO ()
+main = IO (\s0 -> case scrut s0 of
+ (# s1, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21, x22, x23, x24 #) ->
+ unIO (print (I# (x1 +# x2 +# x3 +# x4 +# x5 +# x6 +# x7 +# x8 +# x9 +# x10 +# x11 +# x12 +# x13 +# x14 +# x15 +# x16 +# x17 +# x18 +# x19 +# x20 +# x21 +# x22 +# x23 +# x24))) s1)
=====================================
testsuite/tests/bytecode/T27633/T27633a.stdout
=====================================
@@ -0,0 +1 @@
+300
=====================================
testsuite/tests/bytecode/T27633/T27633b.hs
=====================================
@@ -0,0 +1,39 @@
+{-# LANGUAGE UnboxedTuples, MagicHash #-}
+{-# OPTIONS_GHC -fbyte-code #-}
+
+-- Regression test for #27633 (bug 2): STM retry unwinding
+-- (findRetryFrameHelper/findAtomicallyFrameHelper) must restore
+-- tso->ctoi_tuple_spill_words when it discards a generic stg_ctoi_t frame.
+-- See Note [GHCi unboxed tuples stack spills] in rts/StgMiscClosures.cmm.
+
+module Main where
+
+import GHC.Conc (STM(..), atomically, orElse)
+import GHC.Exts
+import GHC.IO (IO(..))
+import Obj
+
+unIO :: IO a -> State# RealWorld -> (# State# RealWorld, a #)
+unIO (IO f) = f
+
+-- Inside the transaction: case on a 16-field tuple (different spill count
+-- than the outer 24-field one), then retry. The generic stg_ctoi_t frame
+-- pushed for this case is discarded by findRetryFrameHelper.
+innerScrut :: State# RealWorld -> (# State# RealWorld, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int# #)
+innerScrut s0 = case retry# s0 of (# s1, () #) -> (# s1, 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, 10#, 11#, 12#, 13#, 14#, 15#, 16# #)
+{-# NOINLINE innerScrut #-}
+
+stmBody :: STM ()
+stmBody = STM (\s0 -> case innerScrut s0 of
+ (# s1, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14, b15, b16 #) -> (# s1, () #))
+
+outerScrut :: State# RealWorld -> (# State# RealWorld, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int# #)
+outerScrut s0 =
+ case unIO (atomically (stmBody `orElse` return ())) s0 of
+ (# s1, _ #) -> mkT s1
+{-# NOINLINE outerScrut #-}
+
+main :: IO ()
+main = IO (\s0 -> case outerScrut s0 of
+ (# s1, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21, x22, x23, x24 #) ->
+ unIO (print (I# (x1 +# x2 +# x3 +# x4 +# x5 +# x6 +# x7 +# x8 +# x9 +# x10 +# x11 +# x12 +# x13 +# x14 +# x15 +# x16 +# x17 +# x18 +# x19 +# x20 +# x21 +# x22 +# x23 +# x24))) s1)
=====================================
testsuite/tests/bytecode/T27633/T27633b.stdout
=====================================
@@ -0,0 +1 @@
+300
=====================================
testsuite/tests/bytecode/T27633/all.T
=====================================
@@ -0,0 +1,21 @@
+test('T27633a',
+ [ extra_files(['Obj.hs']),
+ req_interp,
+ req_bco,
+ only_ways(ghci_ways),
+ extra_ways(ghci_ways),
+ ],
+ compile_and_run,
+ ['']
+ )
+
+test('T27633b',
+ [ extra_files(['Obj.hs']),
+ req_interp,
+ req_bco,
+ only_ways(ghci_ways),
+ extra_ways(ghci_ways),
+ ],
+ compile_and_run,
+ ['']
+ )
=====================================
testsuite/tests/ghci.debugger/scripts/T27633c.hs
=====================================
@@ -0,0 +1,29 @@
+{-# LANGUAGE UnboxedTuples, MagicHash #-}
+
+-- Stopping at a breakpoint in the case continuation of a large unboxed
+-- tuple return (generic stg_ctoi_t frame) and resuming must re-enter the
+-- frame with the correct tso->ctoi_tuple_spill_words. The continuation
+-- breakpoint is activated via :stepout.
+-- See Note [GHCi unboxed tuples stack spills] in rts/StgMiscClosures.cmm.
+
+module Main where
+
+import GHC.Exts
+import GHC.IO (IO(..))
+import T27633c_obj
+
+unIO :: IO a -> State# RealWorld -> (# State# RealWorld, a #)
+unIO (IO f) = f
+
+poke :: Int -> IO Int
+poke x =
+ return (x + 1) -- line 20: initial breakpoint
+
+scrut :: State# RealWorld -> (# State# RealWorld, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int# #)
+scrut s0 = case unIO (poke 41) s0 of (# s1, _ #) -> mkT s1
+{-# NOINLINE scrut #-}
+
+main :: IO ()
+main = IO (\s0 -> case scrut s0 of
+ (# s1, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21, x22, x23, x24 #) ->
+ unIO (print (I# (x1 +# x2 +# x3 +# x4 +# x5 +# x6 +# x7 +# x8 +# x9 +# x10 +# x11 +# x12 +# x13 +# x14 +# x15 +# x16 +# x17 +# x18 +# x19 +# x20 +# x21 +# x22 +# x23 +# x24))) s1)
=====================================
testsuite/tests/ghci.debugger/scripts/T27633c.script
=====================================
@@ -0,0 +1,13 @@
+:load T27633c.hs
+-- break inside poke, while the generic stg_ctoi_t frame from main's
+-- 24-field tuple case is live on the stack
+:break 20
+main
+-- step out to the small case continuation in scrut
+:stepout
+-- step out again: activates the breakpoint of main's tuple case
+-- continuation BCO, entered through the generic stg_ctoi_t frame
+:stepout
+-- resuming re-enters the stg_ctoi_t frame; with a stale
+-- tso->ctoi_tuple_spill_words this segfaulted
+:continue
=====================================
testsuite/tests/ghci.debugger/scripts/T27633c.stdout
=====================================
@@ -0,0 +1,9 @@
+Breakpoint 0 activated at T27633c.hs:20:3-16
+Stopped in Main.poke, T27633c.hs:20:3-16
+_result :: IO Int = _
+x :: Int = 41
+Stopped in Main.scrut, T27633c.hs:23:17-33
+_result :: (# State# RealWorld, Int #) = _
+Stopped in Main.main, T27633c.hs:(27,19)-(29,193)
+_result :: (# State# RealWorld, () #) = _
+300
=====================================
testsuite/tests/ghci.debugger/scripts/T27633c_obj.hs
=====================================
@@ -0,0 +1,12 @@
+{-# OPTIONS_GHC -fobject-code #-}
+{-# LANGUAGE UnboxedTuples, MagicHash #-}
+module T27633c_obj where
+
+import GHC.Exts
+
+-- Compiled to object code; returns a large unboxed tuple, so the return
+-- into an interpreted caller goes through the native stg_ctoi_t entry code,
+-- which reads tso->ctoi_tuple_spill_words.
+mkT :: State# RealWorld -> (# State# RealWorld, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int#, Int# #)
+mkT s = (# s, 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, 10#, 11#, 12#, 13#, 14#, 15#, 16#, 17#, 18#, 19#, 20#, 21#, 22#, 23#, 24# #)
+{-# NOINLINE mkT #-}
=====================================
testsuite/tests/ghci.debugger/scripts/all.T
=====================================
@@ -153,3 +153,5 @@ test('T26042e', extra_files(['T26042e.hs']), ghci_script, ['T26042e.script'])
test('T26042f1', extra_files(['T26042f.hs', 'T26042f.script']), ghci_script, ['T26042f.script']) # >> is not inlined, so stepout has nowhere to stop
test('T26042f2', [extra_hc_opts('-O -fno-unoptimized-core-for-interpreter'), extra_files(['T26042f.hs', 'T26042f.script'])], ghci_script, ['T26042f.script'])
test('T26042g', extra_files(['T26042g.hs']), ghci_script, ['T26042g.script'])
+
+test('T27633c', extra_files(['T27633c_obj.hs']), ghci_script, ['T27633c.script'])
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d7402a33772fba589ba7ce5bdaf1e7…
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d7402a33772fba589ba7ce5bdaf1e7…
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[Git][ghc/ghc][wip/jeltsch/ghc-9-14-building-base] 113 commits: hie files: Dump the type table when dumping with -ddump-hie
by Wolfgang Jeltsch (＠jeltsch) 07 Sep '26
by Wolfgang Jeltsch (＠jeltsch) 07 Sep '26
07 Sep '26
Wolfgang Jeltsch pushed to branch wip/jeltsch/ghc-9-14-building-base at Glasgow Haskell Compiler / GHC
Commits:
b18c8dd5 by Zubin Duggal at 2026-08-06T15:51:01-04:00
hie files: Dump the type table when dumping with -ddump-hie
- - - - -
f839d0fb by Zubin Duggal at 2026-08-06T15:51:01-04:00
hie files: Take evidence for quantified constraints into account when saving evidence terms to the hie ast
Fixes #25709
- - - - -
5753ebaa by Simon Jakobi at 2026-08-06T15:51:43-04:00
testsuite: fix stale paths for the ghc-config build artifacts
ghc-config.hs moved from testsuite/mk/ to testsuite/ghc-config/ in
6c7a49139c, but the .gitignore entry and the clean rule still referred to
the old location. As a result the compiled ghc-config binary, which
boilerplate.mk rebuilds on every make-driven test run, showed up as an
untracked file and was never cleaned.
Assisted-by: Claude Opus 5
- - - - -
246d4d72 by Simon Peyton Jones at 2026-08-06T15:52:25-04:00
Documentation only
...driven by my investigation of #27591
- - - - -
be69e9df by Alan Zimmerman at 2026-08-06T15:53:05-04:00
EPA: Replace AnnPragma with individual types
We introduced AnnPragma as a common type for all pragma usages wrapped
in LocatedP / SrcSpanAnnP. Now that those are gone, and the AnnPragma
moved into the TTG points for the given items, we can ensure that each
carries only the annotations it needs.
So we remove AnnPragma, and in its place bring in
AnnCType
AnnWarningTxt
AnnOverlap
AnnAnnDecl
AnnPragSCC
- - - - -
0779e12c by Simon Jakobi at 2026-08-07T12:36:11-04:00
Cmm: print unreachable blocks under -dppr-debug (#27368)
Unreachable blocks linger in a CmmGraph's block map for most of the Cmm
pipeline, but pprCmmGraph only ever printed the blocks reachable from the
entry, so dumps looked consistent while the graph was not. Issues like
#27368 were hard to debug due to this.
pprCmmGraph now appends the stored-but-unreachable blocks under a
"// unreachable blocks:" heading when -dppr-debug is on.
See Note [unreachable blocks] in GHC.Cmm.Pipeline.
Assisted-by: Claude Opus 5
- - - - -
3a0f9a51 by Simon Peyton Jones at 2026-08-07T12:36:54-04:00
Fix three bugs related to required type args and INLINE pragmas
* `GHC.Core.Opt.Arity.mkEtaForAllMCo` got the visibility flags back to front,
leading to a Lint error (#27557)
* The arity in an InlineSaturation is the VisArity not the Arity; the
two can differ when we have "required" type arguments. This made the
INLINE pragma argument counting go wrong in `makeCorePair` (#27590).
* When a simple binding has a type signature, we take special path in `tcPolyCheck`,
leading to an outer `AbsBinds` that has no dictionaries, even when the binding
is in fact overloaded. That confused the inline-arity computation in
`makeCorePair` (#27589).
The latter two are fixed using the new function `GHC.HsToCore.Binds.findSatArity`.
That actually simplifies the API of `makeCorePair`, which is nice.
The first bug is fixed by swapping the visiblity flags in
`GHC.Core.Opt.Arity.mkEtaForAllMCo`
Getting the INLINE behaviour right led to some perf changes:
* Runtime /halved/ on T7954 due to better specialisation
* Compile time increased by 6% in T21839c because a bit more inlining
happened, as it always should have done.
* For some reason compile-time max-bytes-used dropped by 30% on
T27336, but only on one build configuration; and it increased
on LinkableUsage02 by 6% on another configuration
Geometric mean effect on our compile time benchmarks is +0.1%.
Metric Decrease:
T27336
T7954
Metric Increase:
LinkableUsage02
T21839c
- - - - -
4f985108 by Vladislav Zavialov at 2026-08-07T17:49:50-04:00
Discard type arguments in tcPatToExpr (#27440, #27583)
The builder expression of an implicitly bidirectional pattern synonym must not
mention types written in the RHS:
* Invisible type arguments led to a panic (#27440)
* Required type arguments failed with out-of-scope variables (#27583)
Both are now discarded, following the precedent established by pattern
signatures (#9867).
Discarding type arguments takes some care: a type pattern cannot be told from a
value pattern by syntax alone, as the `type` keyword may be omitted. Consider:
data T a b c where
MkT :: forall a. forall b c -> a -> T a b c
pattern P :: x -> T x y z
pattern P x = MkT @a (type b) c x
In P's right-hand side, `@a` and `type b` are clearly type arguments, but what
about `c` and `x`? We can only tell by matching the patterns against MkT's
type. So tcPatToExpr now runs in TcM and matches the arguments against the
constructor's TyVarBinders using zipPatsBndrs, which is made public for this
purpose. The resulting builder is $bP x = MkT _ _ x.
See Note [Discarding types in the builder expression].
Test cases: T27440a T27440b T27440c T27440d T27440e
T27583a T27583b T27583c T27583d T27583e T27583f T27583g
Metric Increase: LinkableUsage02
Metric Decrease: T27336
Assisted-by: Claude Opus 5
- - - - -
eb1dcd4d by sheaf at 2026-08-07T17:50:40-04:00
mkWpFun_FRR: fix ordering of coercion composition
When the subsumption machinery generates an eta-expansion, we must
perform a representation polymorphism check to ensure the lambda binder
it introduces has a fixed runtime representation.
This is done in GHC.Tc.Utils.mkWpFun_FRR.
This check involves composing quite a few coercions, arising from
representation-polymorphism checks on both the actual and expected
argument types. These coercions are then chained using HsWrapper
composition, <.>. The ordering of composition was incorrect, leading to
the Core Lint failure reported in #27639. This commit fixes that.
Fixes #27639
- - - - -
3a552476 by Simon Jakobi at 2026-08-09T15:20:06-04:00
Word64Map: add compareSize
compareSize m c compares the size of a map to an Int, but unlike
compare (size m) c it stops traversing the map once the outcome is
determined.
Based on https://github.com/haskell/containers/pull/1139
Assisted-by: Claude Opus 5
- - - - -
6e2c99d8 by Simon Jakobi at 2026-08-09T15:20:06-04:00
Use a pigeonhole sort for deterministic UniqDFM iteration
Deterministic UniqDFM iteration used a list mergesort, allocating O(n
log n) cons cells and contributing significantly to compiler allocations
(#27459).
Use a pigeonhole sort where appropriate, while retaining the mergesort
fallback. See Note [Sorting a UDFM] and Note [Cost of deterministic
iteration].
The peak_megabytes_allocated increase for LinkableUsage02 is probably
due to GC timing noise. See #27613.
-------------------------
Metric Decrease:
InstanceMatching
InstanceMatching1
ManyAlternatives
T12707
T13379
T13719
T24471
T27336
T5321FD
T5321Fun
T783
Metric Increase 'peak_megabytes_allocated':
LinkableUsage02
-------------------------
Assisted-by: gpt-5.6-sol via Codex CLI
- - - - -
a938ab12 by sheaf at 2026-08-09T15:20:48-04:00
Testsuite: don't measure max residency for T27336
We really care more about total allocations for this test, so this commit
removes the maximum residency measurement.
- - - - -
7d94bb78 by Alan Zimmerman at 2026-08-09T15:21:29-04:00
EPA: Remove LocatedE, replace with LocatedA
This gets rid of one more LocatedXXX occurrence
- - - - -
9df24b7e by sheaf at 2026-08-10T14:28:30-04:00
hie.yaml: use a polyglot shell/batch script
This commit merges hie-bios and hie-bios.bat into a single polyglot
script. This avoids Windows users having to manually update hie.yaml
in order to be able to use HLS.
- - - - -
7f75c588 by Alan Zimmerman at 2026-08-10T14:29:11-04:00
EPA: Remove type parameter from AnnList
This is a step towards cutting AnnList down to its core for formatting
lists only
- - - - -
e8d1a0d6 by Bernhard M. Wiedemann at 2026-08-10T21:31:23-04:00
driver: Link object files in a deterministic order
The object files handed to the linker come from the HomePackageTable,
which is ordered by the order in which modules finished compiling. With
-j1 that is the build plan order, with -jN it is whatever the scheduler
produced, so the same sources can link to different (but equivalent)
binaries.
The order reaches the output: .text and .rodata contributions are
concatenated in link order, so e.g. building the hdav executable of the
DAV package twice, once with -j1 and once with -j4, yields two binaries
that differ in ~100kB of section contents.
Sort the home modules by module before collecting their linkables,
guarded under `Opt_ObjectDeterminism` .
Fixes #27612
Signed-off-by: Bernhard M. Wiedemann <bwiedemann(a)suse.de>
- - - - -
556db2f3 by sheaf at 2026-08-10T21:32:06-04:00
Reduce SpecConstr threshold in GHC.Tc.Solver.Rewrite
As remarked in #27628, this module currently sits on a knife's edge: if
the body of 'simplifyArgsWorker' is made even a tiny bit smaller, then
SpecConstr suddenly kicks in and causes disastrous reboxing of the
LiftingContext argument.
To make this less likely to happen, this commit lowers the SpecConstr
threshold.
- - - - -
c77d88fc by sheaf at 2026-08-13T10:15:22-04:00
Allow rewriting in RuntimeReps for newtype ConPats
This commit implements PHASE 2 of the FixedRuntimeRep plan described in
Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype
constructor patterns.
In short, GHC now accepts programs of the form
f (MkN x) = ...
in which the argument 'x' of the newtype constructor pattern 'MkN x'
has a representation that is not syntactically concrete, e.g. it can be
'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples.
There are two main parts to the implementation:
1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat.
See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat.
2. Desugaring. We restructure the code for desugaring pattern matches
by allowing the scrutinised match variable to be casted. This allows
us to accumulate coercions and avoids creating binders at intermediate
types tha don't have a fixed RuntimeRep.
See the revamped Note [Match Ids] in GHC.HsToCore.Monad.
Fixes #20363
-------------------------
Metric Increase:
InstanceMatching
-------------------------
- - - - -
6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00
Improve the documentation of `--show-iface`
This change in particular gets rid of the claim that `--show-iface`
writes *the* contents of the interface file in question. It doesn’t do
that; it only writes those parts that are likely of interest to a human
reader.
- - - - -
4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00
RTS: fix LDV profiler's slop skipping (#27585)
processHeapForDead was the one heap scanner not updated for the slop
marker encoding introduced in #19048. It still assumed slop is zeroed:
while (p < bd->free && !*p) p++; // skip slop
so it stopped at the (StgWord)(-1) sentinel and passed it to
processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage
size was read out of LDVW and the scan ran off the block, tripping
ASSERT(p == bd->free) on a debug RTS and silently corrupting the census
otherwise.
The loop was hand-copied in four places, so factor it out into skipSlop
in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and
LdvProfile.c.
Co-Authored-By: Claude Opus 5 (1M context) <noreply(a)anthropic.com>
- - - - -
1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00
hadrian: Fix links to remaining doc sites to not use the package hash for haddock links
In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock
directory. This patch takes care of a few remaining links that were missed in that patch
Fixes #27671
- - - - -
257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00
Testsuite: widen InstanceMatching acceptance window to 5% (#27673)
...in order to unblock CI.
Assisted-by: Claude Fable 5
- - - - -
e4cfaaa0 by Simon Peyton Jones at 2026-08-14T01:09:32+02:00
Major patch to re-engineer known-key names
This big patch implements the New Plan for known-key names,
described in #27013.
Read the big Note [Overview of known-key names] in GHC.Types.Name
Some things had to be reworked slightly to accomodate the new known-keys
design. A significant one was the generation of auxiliary KindRep
bindings, which was greatly simplified. Note [Grand plan for Typeable]
was updated accordingly. Another example: GHC.Internal.CString was
merged into GHC.Internal.Types.
Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita(a)gmail.com>
The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed
Metrics: compile_time/bytes allocated
-------------------------------------
Baseline
Test Metric value New value Change
------------------------------------------------------------------------------------------
MultiComponentModules100(normal) ghc/alloc 24,312,779,672 24,990,470,432 +2.8% BAD
MultiComponentModulesRecomp(normal) ghc/alloc 601,924,960 621,884,888 +3.3% BAD
MultiComponentModulesRecomp100(normal) ghc/alloc 11,884,065,432 12,531,373,704 +5.4% BAD
MultiLayerModules(normal) ghc/alloc 3,861,537,072 3,706,919,512 -4.0% GOOD
T13701(normal) ghc/alloc 3,517,246,392 3,237,179,616 -8.0% GOOD
T13820(normal) ghc/alloc 28,961,056 29,663,208 +2.4% BAD
T14697(normal) ghc/alloc 472,044,184 443,550,048 -6.0% GOOD
T18140(normal) ghc/alloc 47,905,664 49,115,808 +2.5% BAD
T4801(normal) ghc/alloc 269,339,096 263,432,040 -2.2% GOOD
T783(normal) ghc/alloc 341,112,672 333,339,952 -2.3% GOOD
hard_hole_fits(normal) ghc/alloc 222,164,728 213,433,808 -3.9% GOOD
mhu-perf(normal) ghc/alloc 49,011,440 46,706,280 -4.7% GOOD
geo. mean +0.1%
minimum -8.0%
maximum +5.4%
All performance regressions were investigated in depth. The surviving
ones:
- MultiComponentModules100, MultiComponentModulesRecomp100,
MultiComponentModulesRecomp regresses because existing bugs that make
an additional implicit edge do too much redundant work: #27053 and #27461
- T13820, T18140, T10547, T13035 regress because we load an additional
interface and associated Names for GHC.Essentials.
-------------------------
Metric Decrease:
MultiLayerModules
T13379
T13701
T14697
T26989
T4801
T783
T9961
hard_hole_fits
mhu-perf
size_hello_artifact
size_hello_obj
size_hello_unicode
Metric Increase:
LinkableUsage01
LinkableUsage02
MultiComponentModules100
MultiComponentModulesRecomp
MultiComponentModulesRecomp100
T10547
T13035
T13820
T18140
T18698a
T18698b
T20049
-------------------------
Bumps submodule binary
Closes #27013
- - - - -
61665e79 by sheaf at 2026-08-14T01:09:33+02:00
Allow GHC.Essentials to be hidden
This commit overhauls several aspects of the known entity handling,
in order to allow GHC.Essentials to be hidden without a proliferation
of special cases in the compiler.
The main contribution is to introduce the 'UnresolvedImport' datatype
which cleans up a lot of ad-hoc handling relating to 'ModSummary',
fixing #27603. This allows us to reduce duplication, e.g. by having
Backpack reuse 'mkUnresolvedImports' instead of replicating the
"add implicit imports" logic. It also makes it easier to avoid
undesirable edge cases (such as making sure that the Template Haskell
'reifyModule' function does not leak the implicit GHC.Essentials import).
In particular, the infamous 'findImportedModuleWithIsBoot' is now simply
'resolveImport', taking a single 'UnresolvedImport' and resolving it
to a 'FindResult' (usually a 'Module').
Other changes:
- Cache the result of looking up GHC.Essentials (in TcM and DsM
environments) to avoid redundant work.
This reduces allocations on LinkableUsage01 and hard_hole_fits.
- Properly look up known entities for StaticPointers like we do for
other known entities everywhere else. This allows e.g. modules in
ghc-internal to use -XStaticPointers.
- When using multiple home units, we are now careful to handle the
situation in which we may have multiple GHC.Essentials modules
around. See the new tests under 'driver/multipleHomeUnits'.
- - - - -
b19fcc1c by Vladislav Zavialov at 2026-08-14T06:26:11-04:00
Increase test coverage of diagnostics, batch 2
Add test cases for the previously untested diagnostics:
[GHC-26133] TcRnForeignImportPrimSafeAnn
[GHC-68444] SumAltArityExceeded
[GHC-63966] IllegalSumAlt
[GHC-23882] IllegalDeclaration
[GHC-60220] InvalidCCallImpent
[GHC-18816] RecGadtNoCons
[GHC-38140] GadtNoCons
[GHC-37056] InvalidTypeInstanceHeader
[GHC-78486] InvalidTyFamInstLHS
[GHC-39639] DefaultDataInstDecl
[GHC-78822] AssocDefaultNotAssoc
[GHC-43510] NotSimpleUnliftedType
[GHC-41843] IOResultExpected
[GHC-07641] AtLeastOneArgExpected
[GHC-52886] InvalidTopDecl
Remove unused error constructors:
[GHC-92057] ImportLookupAmbiguous
- - - - -
7b27f25a by Simon Jakobi at 2026-08-14T06:26:54-04:00
testsuite: Drop peak_megabytes_allocated from LinkableUsage tests
LinkableUsage01/02 collected all metrics with a 2% tolerance. For
peak_megabytes_allocated, whose granularity is 1 MB, that window is
under 0.7 MB at this test's ~34 MB peak, so any 1 MB step failed the
test (#27613, #27489). Drop that metric: max_bytes_used guards the
Linkable-retention property with byte granularity, at a tolerance
that still comfortably exceeds the noise observed in CI.
Assisted-by: Claude Fable 5
- - - - -
e5de423b by Simon Jakobi at 2026-08-14T06:26:54-04:00
testsuite: Don't truncate fractional baselines when computing bounds
RelativeMetricAcceptanceWindow.get_bounds truncated the baseline with
int() before applying the tolerance. Baselines can be fractional (they
are averaged over several measurements), so this skewed the acceptance
window downwards: in #27613, a baseline of 33.67 at 2% tolerance
yielded bounds (32, 34) instead of (32, 35), rejecting a measurement
that was within tolerance.
Assisted-by: Claude Fable 5
- - - - -
db959f83 by Simon Jakobi at 2026-08-14T15:16:44-04:00
testsuite: Expect length001 failure in nonmoving_thr_sanity
length001 relies on an optimization rule to avoid excessive stack use.
The nonmoving_thr_sanity way does not enable optimization, so classify
its stack overflow as an expected failure, as is already done for the
other unoptimized nonmoving ways.
Assisted-by: gpt-5.6-sol via Codex CLI
- - - - -
4f2b7d90 by Simon Jakobi at 2026-08-14T15:16:44-04:00
testsuite: Omit T22859 in nonmoving threaded ways
T22859 checks allocation-limit handlers with output that depends on
precise allocation behaviour. The nonmoving threaded ways change where
these limits are reached, just as the already-omitted LLVM ways do.
Omit these ways instead of treating their incidental output differences
as test failures.
Assisted-by: gpt-5.6-sol via Codex CLI
- - - - -
c4abddcb by Simon Jakobi at 2026-08-14T15:16:44-04:00
rts/js: Implement eq_thread, and test Eq/Ord ThreadId (#16761)
Since d1f3c63701, Eq ThreadId is implemented via the RTS function
eq_thread, but the JS RTS never provided it, so comparing ThreadIds
for equality on the JS backend crashed with
ReferenceError: h$eq_thread is not defined
Like the C implementation, h$eq_thread uses pointer equality: The JS
RTS has exactly one thread object per thread.
Since previously no test exercised eq_thread directly, this commit
adds a test covering equality, its stability across GC, and agreement
with Ord.
Assisted-by: Claude Fable 5
- - - - -
4a7defa1 by Simon Jakobi at 2026-08-14T15:16:44-04:00
testsuite: Make listThreads1 insensitive to the RTS's own threads
listThreads1 expected `listThreads` to return exactly [ThreadId 1]. That
holds only under a non-threaded RTS. Under a threaded RTS however there
are more threads present, so we change the test to simply check that
`myThreadId` is present in the list.
Assisted-by: Claude Opus 5
- - - - -
b757727a by Vladislav Zavialov at 2026-08-14T15:17:27-04:00
Fix tcLookupId panic with RequiredTypeArguments and PatternSynonyms (#27586)
The arguments declared on the left-hand side of a pattern synonym are looked up
as term variables bound by its right-hand side. Prior to this patch, that lookup
panicked with RequiredTypeArguments:
data T a where
MkT :: forall a -> T a
pattern P :: Int -> T Int
pattern P x = MkT x
On the RHS, `x` looks like a term argument, so the renamer binds it in the term
namespace. Only during type checking does it turn out to be a type variable, so
the lookup on the LHS finds an ATyVar rather than an ATcId. As the lookup was
done with tcLookupId, it resulted in a panic.
Now the arguments are looked up with tcLookupPatSynArg, which reports an illegal
term-level use of `x`, just as an ordinary function definition `f (MkT x) = x`
does.
Test cases: T27586a T27586b T27586c
Assisted-by: Claude Opus 5
- - - - -
c130188d by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00
loopImports: Don't dup ms_uid in summary imports
We were writing the ms_unitid of the mod summary with every single
import of that module
That complicated the code (as though the UnitId in that list could ever
be something else) and also allocates unnecessarily per every mod
import. Very slight allocation decrease measured locally in a few tests:
(MultiComponentModulesRecomp: -0.06%; MultiComponentModulesRecomp100: -0.05%)
Purely a clean up.
- - - - -
c71166a8 by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00
downsweep: make control flow simpler and cache correct
This refactor extracts the control flow of downsweep into a single
function `dfsBuild`, which takes care of iteratively expanding and
traversing all nodes of the in-construction module graph necessary to
build a full `ModuleGraph`.
There are three levels of caching going on, all of which are necessary
to make sure we don't do repeated work (notably, NEVER summarise the
same module twice).
1. `dfsBuild` accumulates the final module graph and never revisits the
same node of the module graph. Cache is keyed by the final
`ModuleGraph`s `NodeKey`s.
2. For Module A in home-unit u1, each import in the list of imports
needs to be *found* (call to `findImportedModuleWithIsBoot`): at this
point, we only have the `ModuleName` of the import, not the `Module`.
This *finding* is somewhat expensive, so we cache it as well
(`ImportsCache`). The cache key is the home-unit to which the module
belongs~[1], the import package qualifier, and the ModuleName.
[1] Different home-units will have different package flags, which means
potentially different `Module` resolution for the same `ModuleName`.
3. The most expensive operation we want to avoid is summarising a
`Module` into a `ModSummary`, which notably involves parsing the
module header from scratch.
The third cache, in essence, maps a `Module` to its `ModSummary`
(named `ModSummaryCache`). This cache upholds the invariant: we NEVER
summarise the same module twice. In practice, the cache key is the
Module's UnitId and the Source path; the reason is we need to
distinguish between `.hs` and `.hs-boot` files, as their summaries
will differ.
Note that (2) can't guarantee this alone: Two ModuleName imports in
separate units can (and likely do) map to the same `Module`.
Note that the previous implementation failed to achieve the
no-duplicate-work summarisation invariant, and we ended up doing a
quadratic amount of processing in scenarios like test
`MultiComponentModules100`.
See also Note [Downsweep Control Flow and Caching]
Fixes #27461
Perf changes:
MultiComponentModules(normal) ghc/alloc 2,097,389,264 1,992,186,736 -5.0% GOOD
MultiComponentModules100(normal) ghc/alloc 24,310,173,770 21,293,867,360 -12.4% GOOD
MultiComponentModulesRecomp(normal) ghc/alloc 602,761,394 498,543,984 -17.3% GOOD
MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,968,240 8,895,404,864 -25.2% GOOD
-------------------------
Metric Decrease:
MultiComponentModules
MultiComponentModules100
MultiComponentModulesRecomp
MultiComponentModulesRecomp100
-------------------------
- - - - -
ebc4047b by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00
implicitRequirementsShallow can never reach HoleUnit
findImportedModule will never return `HoleUnit` for a `ModuleName`
(a `HoleUnit` can only be found as a signature instantiation, never as a
directly *imported* thing)
Therefore, we can drop `[ModuleName]` returned by
`implicitRequirementsShallow`, which makes many things dead code.
Namely, the call to `implicitRequirementsShallow` from
GHC.Driver.Downsweep which was a performance bottleneck (for doing lots
of duplicate work in findImportedModule) is now entirely gone.
Fixes #27053
In an MR with this patch and the downsweep refactor (previous commit), CI says:
MultiComponentModules(normal) ghc/alloc 2,097,396,728 1,943,662,304 -7.3% GOOD
MultiComponentModules100(normal) ghc/alloc 24,310,182,136 17,227,574,440 -29.1% GOOD
MultiComponentModulesRecomp(normal) ghc/alloc 602,769,518 449,973,656 -25.3% GOOD
MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,976,408 4,828,894,160 -59.4% GOOD
-------------------------
Metric Decrease:
MultiComponentModules
MultiComponentModules100
MultiComponentModulesRecomp
MultiComponentModulesRecomp100
-------------------------
- - - - -
85a6ab01 by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00
downsweep: Cache negative results
When traversing a module graph structure, a uniquely identified node
should always expand to the same thing.
I don't see how visiting the same node which failed to be expanded a
first time would ever successfully expand the second time we try to
expand it (eg. when coming from a different edge to it -- it is still
the same node!). The node expansion is local, based just based on the
node itself, not on the path to get there.
Therefore, this patch removes the weird behavior and commentary of
`dfsBuild` wrt to `Nothing` not being cached and being potentially
expanded a second time around to something different, which was
misleading and, ultimately, incorrect.
Now, we have a `MGRes`, which is more explicit about a node being
Skipped just being a node that is ignored whenever it is found (and that
skip is cached) -- and we may want to do this due to failures or due to
just trying nodes which might not work on purpose, like hs-boots.
We uniformly cache positive and negative results and remove the
assumption that there might be an ordering in which the same node
visited at a later time might be expanded differently.
This makes it possible to traverse the module nodes in parallel without
a change in behavior, since there's no longer a hidden ordering
requirement.
- - - - -
56747c3f by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00
Organize and clean-up GHC.Driver.Downsweep
Simply some cosmetic changes, moving definitions around to structure the
module better into its relevant sections
(In go (ns ++ ss), it's not a problem to use ++ because it's a good
producer and we won't have to append fully before processing the next
item in go)
- - - - -
12f64118 by Wolfgang Jeltsch at 2026-08-15T06:31:12-04:00
Add support for textual output of bytecode file content
- - - - -
a737df91 by Brandon Chinn at 2026-08-15T12:40:25-04:00
Add law in qualified strings doc
- - - - -
e3188581 by Zubin Duggal at 2026-08-15T12:41:06-04:00
DmdAnal: Fix maxDmdType
We need to eta expand the smaller DmdType using defaultArgDmd, like in lubDmdType.
Introduce zipDmdType as a common combinator to implement both maxDmdType and lubDmdType
uniformly.
fixes #27626
- - - - -
ca9b0b22 by mangoiv at 2026-08-15T12:41:47-04:00
hadrian: set the executable bit for hie-bios.bat
- - - - -
1aac7095 by sheaf at 2026-08-16T04:37:16-04:00
Avoid wasteful allocations in mkTyConAppCo
The idiom "traverse isReflCo_maybe" followed by "map fst" used in
'GHC.Core.Coercion.mkTyConAppCo' was allocating a lot of waste.
This commit uses 'GHC.Data.Unboxed.traverseMaybeUB' to avoid all these
unnecessary intermediate allocations.
In a quick microbenchmark for 'mkTyConAppCo', this change resulted in:
- refl case (all argument coercions are reflexive):
- -60% runtime
- -80% allocations
- non-refl case:
- from 0% to -12% runtime (depending on which argument is non-refl)
- from 0% to -70% allocations ( -- '' -- )
Fixes #27648
-------------------------
Metric Decrease:
FamAppCachePerf
SimplCastPerf
T12425
T15703
T26426
T3064
T9872a
T9872b
T9872b_defer
T9872c
T9872d
T5321Fun
T9020
T9630
TcPlugin_RewritePerf
Metric Increase:
LinkableUsage02
-------------------------
- - - - -
3915e982 by Alan Zimmerman at 2026-08-16T04:37:58-04:00
EPA: Remove al_trailing from AnnList
It was not being used
- - - - -
fed942ac by Andreas Klebinger at 2026-08-17T12:11:57-04:00
testsuite: Use sigkill in process009.
SIGHUB might have been blocked by a (grand)*parent of the test.
In such cases the test would fail as the python process would simply
exist gracefully instead of committing to a premature end.
By using SIGKILL we can rely on the signal not being blocked, fixing #27578
in the process.
- - - - -
574c875f by Andreas Klebinger at 2026-08-17T12:12:39-04:00
Simplify comparison in DFM.hs
Fixes #27669
- - - - -
d8f1a2a3 by Alan Zimmerman at 2026-08-17T12:13:18-04:00
TTG: Add extension points to BooleanFormula
They are currently unused, but will be used for exact print
annotations next, allowing us to get rid of LocatedBF / SrcSpanAnnBF
- - - - -
93a2b20f by Andreas Klebinger at 2026-08-18T04:31:04-04:00
Fix a number of incorrect module references:
Fix module reference in Note [DataCon wrappers are conlike].
Fix module reference in Note [Detailed InertCans Invariants].
Fix module reference in Note [GHC's data format representations].
Fix module reference in Note [Grand plan for static forms].
Fix module reference in Note [How tuples work].
Fix module reference in Note [Solved dictionaries].
Fix module reference in Note [Stacktraces from Info Table Provenance Entries (IPE based stack unwinding)].
Fix module reference in Note [The VarBndr type and its uses].
Found the incorrect references with a llm.
- - - - -
eb0dfb01 by Simon Jakobi at 2026-08-18T04:31:44-04:00
ci: Run stack-hadrian-build only in full-ci pipelines
The job exists to catch changes that break hadrian/build-stack (#18726),
but nothing in the pipeline depends on it, and it can only break when
hadrian's dependencies change. Restricting it to full-ci (like
hadrian-multi) still covers marge-bot merge batches, so such breakage
cannot reach master unnoticed, while ordinary validate pipelines skip
the job.
Assisted-by: Claude Fable 5
- - - - -
b9160962 by Simon Jakobi at 2026-08-20T14:57:52-04:00
testsuite: Show baseline sample count and range in perf failures
A perf baseline is the mean of all samples recorded for a commit, and
it prints as a single number, hiding how far the samples spread. When
the spread is wide, this can indicate an unstable metric that isn't
actually useful as a signal for the perf tests.
For example, in #27602, T27336's peak_megabytes_allocated baseline
showed as 757 when the underlying samples were 605 and 909.
When the baseline is averaged from more than one sample, say so in the
failure output: the one-line stat-failure reason shows the sample
range, and the detail block lists the raw samples. Single-sample
baselines print exactly as before.
Context: #27602
Assisted-by: Claude Fable 5
- - - - -
a4979877 by Simon Jakobi at 2026-08-20T14:57:52-04:00
testsuite: Fold Baseline into CommitMetric
A Baseline was just a CommitMetric plus the commit it came from, built
by copying fields across. Since get_commit_metric already knows that
commit, record it on CommitMetric itself and drop Baseline. This also
collapses both branches of find_baseline into plain returns.
Assisted-by: Claude Fable 5
- - - - -
99fb8d68 by Simon Jakobi at 2026-08-20T14:57:52-04:00
ci: Clarify comment on pushing perf notes after failures
Context: #27602
Assisted-by: Claude Fable 5
- - - - -
2ca87972 by Alan Zimmerman at 2026-08-20T14:58:36-04:00
EPA: Remove LocatedBC / SrcSpanBF
The custom annotations are now in the BooleanFormula TTG extension
points, so LBooleanFormula can now use the standard LocatedA.
- - - - -
d2bc32aa by Simon Peyton Jones at 2026-08-21T12:59:26-04:00
Better handling of serialisation of wired-in names
Fixes #27501
- - - - -
d2795ffc by Alan Zimmerman at 2026-08-21T13:00:05-04:00
EPA: Remove NoEpTok/NoEpUniTok, using an unhelpful SrcSpan instead
Also introduce helper functions noEpTok and noEpUniTok to serve
as simple replacements in code inserting an token annotation without
location information.
- - - - -
b5d29ab8 by Brandon Chinn at 2026-08-25T18:42:08-04:00
Add Data.RealFloat and Infinity/NegInfinity/NaN pattern synonyms (#26961)
- - - - -
e60eb3bc by Andreas Klebinger at 2026-08-25T18:42:59-04:00
rts linker: Fix pointer arithmetic issue in flushInstructionCacheRISCV64
We accidentally operated over `uint64_t*` when we should use `uint8_t`.
Fixes #27569
- - - - -
e9bbe8f9 by Andreas Klebinger at 2026-08-26T15:09:23-04:00
cmm dumps: Add machop width info with -dppr-debug for infix ops.
- - - - -
86e3a9d8 by Andreas Klebinger at 2026-08-26T15:09:24-04:00
CmmLint: Check for unsupported MachOp widths
machOpArgReps now maps MachOp + Width to a list of supported
argument widths or Nothing if the given operation is not supported
at the given width.
This allows us to check for nonsensical combinations like FloatToInt
at Word16.
Similarly we now check that every address is actually wordwidth.
- - - - -
13781cca by Andreas Klebinger at 2026-08-26T15:09:24-04:00
arm64 ncg: The big subword truncation fix.
A set of slightly related fixes to arm subword handling:
Bitmask immediates:
Don't produce overflowing assembly literals.
There is still another bug here that causes us to miss some valid
literals but we will fix that later.
Improve subword truncation handling:
We now use a small set of helpers to truncate `Register` values rather
than truncating immediate `Reg` values which greatly simplifies the code
structure. This fixes a great many bugs to do with sign/zero extending subwords
or the lack thereof.
We now establish the invariant that subword values are zero-extended at
every site at which they come into "scope" of the ncg, and rely on the
invariant throughout rather than pessimistically inserting redundant
extensions in a hodgepodge manner at the use sites of these values.
This fixes at least the bugs described in issues #27533, #27430
#27537, #27538, #27539, and #27550. But likely more bugs yet not
found.
Subword ffi results:
Apply truncations when calling functions returning
subword values.
genCondJump:
Don't sign extend signed values in the input register as
it might map to a local variable, corrupting the value stored within.
Fix subword store/load instructions.:
We used to read those at 32bit width even for smaller values possibly
resulting in invalid memory access. Now we construct the suffix for
subword variants based on the instruction format for these.
- - - - -
d8fa5d7c by Andreas Klebinger at 2026-08-26T15:09:24-04:00
arm64 ncg: Fix MO_V_Broadcast for non-literals.
We now use OpReg instead of OpScalarAsVec as required since we broadcast a gp register.
Also adds a test. Fixes #27565.
- - - - -
94822c95 by Andreas Klebinger at 2026-08-26T15:09:24-04:00
Add some test cases covering bugs in the arm ncg.
* Test for #27430 (subword ffi results)
* #27537 - subword conversions
* #27538 - subwords used in conditional
* #27533 - single byte read
- - - - -
dd1ba88a by Andreas Klebinger at 2026-08-26T15:09:24-04:00
cmmLint: Lint against MO_FS_Truncate subword use.
- - - - -
fd22f71e by Zubin Duggal at 2026-08-26T15:10:20-04:00
ghc-internal: annotateSTM should use catchSTM# rather than catch#
A catch# frame inside a transaction breaks retry and async exception
delivery.
Fixes #27657
- - - - -
bb324171 by Rodrigo Mesquita at 2026-08-26T15:10:59-04:00
rts: refactor to reduce THREADED_RTS in MSG_UPD_TSO_FLAGS
- No behavior change in this commit (well, a small optimization here
makes us do less work if the target TSO owned by the curr. capability)
- Move all THREADED_RTS CPP needed into `updThreadFlag`
- Merge MSG_SET_TSO_FLAGS and MSG_UNSET_TSO_FLAGS into MSG_UPD_TSO_FLAGS
plus a `set` bool field in the MessageUpdTSOFlag struct
Towards #27729
- - - - -
ed99b7b7 by Rodrigo Mesquita at 2026-08-26T15:10:59-04:00
rts: Fix race condition in MSG_UPD_TSO_FLAGS execution
The code for processing the MSG_UPD_TSO_FLAGS message was not taking
into consideration that the TSO's owner might have moved in between that
capability receiving the message (since it was its previous owner) and
starting to process its inbox (a point at which it was no longer the
owner)
Added Note [TSO owner may change in between Msg being sent and received]
to explain this race and the pattern used to fix this, where we just
forward the message to the new owner.
Fixes #27729
- - - - -
cd653714 by Alan Zimmerman at 2026-08-26T15:11:49-04:00
EPA: Uses Parsers.parseModule for exactprint tests
Parsers.parseModule is the advertised way to parse for use for exact
printing in the ghc-exactprint library. This commit updates the GHC
exact print testing to use it.
This requires moving the comment balancing that was occurring
only in the test path into the advertising parser path, so it moves
from Transforms.hs to Utils.hs.
Also update the comment adding to honour trailing annotations
- - - - -
d1d01fa5 by Wolfgang Jeltsch at 2026-08-27T13:17:59+03:00
Add `rethrowSTM` and improve STM-related documentation
Adding `rethrowSTM` resolves #26758.
The implementation of `rethrowSTM` is completely analogous to the one of
`rethrowIO`.
The following is established for the documentation of `throwSTM` and
`catchSTM`:
* Both operations are directly described as analogs of their `IO`
counterparts.
* There is no reference to `throw` in the documentation of `throwSTM`,
because, although such a reference is great in the documentation of
`throwIO`, it is somewhat out of place in the documentation of
`throwSTM`.
* Instead of repeating part of `throwIO`’s documentation, the
documentation of `throwSTM` just recommends using `throwSTM` instead
of `throw` and references the corresponding arguments in the
documentation of `throwIO`.
- - - - -
06fde293 by fendor at 2026-08-28T06:06:44-04:00
GHCi: Fix order of `PackageDBFlag`s for interactive home unit
`PackageDBFlag`s are stored in reverse order of cli specification.
When sorting the `PackageDBFlag`s by longest common prefix, we need thus
to reverse the package db stacks before calculating the prefix.
We make sure to reverse the package db stack for the interactive home
unit to uphold that later specified package dbs overwrite earlier ones.
Resolved and adds regression test for #27640
- - - - -
024c4d04 by fendor at 2026-08-28T06:07:23-04:00
Reuse the UnitIndexCache after initialising multiple home units
- - - - -
55326fa0 by Alan Zimmerman at 2026-08-28T06:08:03-04:00
EPA: Some Haddock processing tweaks
These changes to the Haddock postprocessing should not change
behaviour, but just bring it more closely in line with the
original, changed at 44309cd377f
And add some haddock exactprint tests to show they work.
- - - - -
b3ddee95 by Andreas Klebinger at 2026-08-28T13:57:46-04:00
hadrian: Deprecate quickest flavour.
It was more of a trap for new users than actually beneficial so we
deprecate it and suggest quick+no_dynamic_libs to users instead.
- - - - -
a1d81390 by Andreas Klebinger at 2026-08-28T13:58:37-04:00
cmm: Always favour entry block during block deduplication.
We now always keep the first block in the CmmGraph. This way we avoid
the need to update the entry info table.
Failing to do so caused #27722.
Fixes #27722.
- - - - -
5bd65f00 by Andreas Klebinger at 2026-08-28T13:59:16-04:00
test: FamAppCachePerf - Only collect bytes allocated. Fixes 27747
- - - - -
ced53ce6 by mangoiv at 2026-08-29T07:15:24-04:00
nightlies: output yaml to file only
Previously we would just output the metadata to stdout
which risks that it's clobbered by incidental debugt output.
We now output to file only.
Fixes #27511
- - - - -
578bd185 by Andreas Klebinger at 2026-08-29T07:16:05-04:00
Specialise: Stop looping on recursive dictionaries in interestingDict
interestingDict now doesn't look through loopbreaker unfoldings.
Doing so would cause infinite loops on certain dictionaries.
Fixes #27705.
- - - - -
7bf546fc by Simon Peyton Jones at 2026-08-31T23:48:53-04:00
Never make an absent filler for a constraint type
mkAbsentFiller used isTerminatingType to decide, but that is not enough.
Consider
class Eq a => UC a where {}
let u :: UC Int -- UC Int is a "non-terminating type"
u = error "Absent"
let e :: Eq Int -- Eq Int is a "terminating type"
e = $p1UC u
We clearly must not make a filler for `e`, because we speculatively
evaluate it. But speculatively evaluating `e` forces `u`, so we must not
make one for `u` either.
Asking isDictTy instead is not enough either, because it does not catch a
constraint hidden behind an unreduced type family application:
type family F a :: Constraint
type instance F W = TC W
a :: F W => Int -> Int -- (F W) argument is absent
Oops! Entered absent arg Arg: irred
Type: F W
So play safe and use isPredTy: never make an absent filler for any
constraint-kinded type.
Fixes #27627
- - - - -
5f474953 by Zubin Duggal at 2026-08-31T23:48:53-04:00
Add tests for absent fillers at dictionary types
T27627 a unary class whose superclass is a non-unary class
T27627a ...whose superclass is a Constraint-kinded type family
T27627b ...whose superclass is a quantified constraint
T27627c a unary class applied to itself, (UC (UC (TC a)))
T27627e a (forall b. P b) dictionary that loops
- - - - -
cd5c6bcc by Zubin Duggal at 2026-08-31T23:48:53-04:00
An abstract TyCon may hide a unary class
A class declared in an hs-boot file is an AbstractTyCon inside the
module loop, and compiling the real declaration may reveal it to be a
UnaryClassTyCon.
- isTerminatingType returned True for such AbstractTyCons
- IfaceToCore set the unary flag to False in the DFunId
So we could end up speculating bottom dictionaries because inside a module
loop we see an UnaryClassTyCon as an AbstractTyCon
Use isTerminatingTyCon, which returns False for an abstract TyCon.
The Bool in DFunId is now a cache for isTerminatingTyCon, set in
mkDFunIdDetails.
Fixes #27704
- - - - -
abfc224a by Zubin Duggal at 2026-08-31T23:48:53-04:00
Specialise: don't replace dead args with absent fillers
specHeader decides an argument is dead by calling isDeadBinder on a binder of
the /optimised RHS/, then applies the filler to the /stable unfolding/
template instead. The two may differ, so the argument can be dead in
the RHS and not in the template.
The specialised function's unfolding then has an absent filler, and any call
site that inlines it evaluates the error thunk.
Dropping dead args in the specialiser is rarely worth it, to quote Simon,
"The later worker/wrapper pass will pick up the dead arg later if it is really dead. Keeps the specialiser simpler."
So instead of trying to check if the arg really is dead in the stable unfolding,
just drop the logic for dropping dead args in the specialiser altogeher.
Fixes #27703
- - - - -
1557fd1c by Zubin Duggal at 2026-08-31T23:48:53-04:00
CorePrep: don't speculate a call across an hs-boot edge
We take care not to evaluate things that might be bottom, like a
looping dictionary group, but our analysis is defeated by boot files.
We only track recursion within a module, so two dictionaries that
depend on each other across a module loop each look non-recursive, and
we might speculate them.
Any recursion we cannot see must cross an hs-boot edge, so refuse to
speculate calls that cross one.
Fixes #27717
- - - - -
4117e5ae by Wolfgang Jeltsch at 2026-08-31T23:49:35-04:00
Incorporate the `rethrowSTM` reexport into the `stm` submodule
- - - - -
4bfbf5c8 by ARATA Mizuki at 2026-09-01T18:55:08-04:00
testsuite: Fix out-of-bounds access in T3586
unsafeRead and unsafeWrite use 0-based index.
Looking at #3586, the expected output seems to be 2.8e8.
Addresses #27596
- - - - -
3f9db6d4 by ARATA Mizuki at 2026-09-01T18:55:08-04:00
testsuite: Fix out-of-bounds access in T21305
writeInt64Array# takes an index measured in units of Int64 elements.
Fixes #27596
- - - - -
44d7788f by Simon Peyton Jones at 2026-09-01T18:55:53-04:00
Fix buglet in INLINE-arity calculation for pattern synonyms
This fixes #27744.
The buglet was accidentally introduced by
commit 3a0f9a51c1dacc474c7fd128082edd8bf4081256
Author: Simon Peyton Jones <simon.peytonjones(a)gmail.com>
Date: Sat Aug 1 00:13:02 2026 +0100
Fix three bugs related to required type args and INLINE pragmas
I failed to find all the calls to `addInlinePragArity`!
- - - - -
df058f1d by Simon Jakobi at 2026-09-02T07:18:06-04:00
testsuite: Migrate perf tests off collect_compiler_stats('all')
The 'all' metric argument applies a single tolerance to bytes
allocated, max_bytes_used and peak_megabytes_allocated, although their
noise profiles are incompatible (#27653): allocations are nearly
deterministic, residency needs 10-20%, and peak is quantized to 1 MB.
Any single tolerance is too tight for one metric or too slack for
another. This migrates the remaining users of 'all' (and of the 'all'
default) to explicit per-metric collection, ahead of removing 'all'
from the driver.
peak_megabytes_allocated is dropped everywhere: its 1 MB granularity
makes tight relative windows meaningless (#27613), and it is sensitive
to GC timing. In #27489 it drifted by -5.3% while max_bytes_used moved
by less than 0.1%. Where a test guards a memory property,
max_bytes_used covers it at byte granularity.
Where the motivating ticket was about compile-time memory
(T11545, T15304, T26425), residency remains gated via max_bytes_used,
now with a residency-appropriate tolerance.
max_bytes_used is dropped where residency was only ever an accident of
'all':
* T15630, T15630a, T20261: the underlying tickets (#15630, #20261)
contain no memory data at all. One is a simplifier-ticks blowup and
the other is stated entirely in allocation numbers, so the 20%
window never had teeth.
* T21839c: #21839's measurements show residency essentially flat
(+0.16%) while allocations moved +7%, so allocations are the
discriminating metric. They are already gated at 1% via
collect_compiler_runtime. The ghc/max gate had previously broken CI
spuriously (9fd11585eb widened it from 1% to 10% for that reason).
Allocation tolerances are tightened to the testsuite's conventional 2%
where 'all' previously left them at 10-20%.
Assisted-by: Claude Fable 5
- - - - -
72dd2432 by Simon Jakobi at 2026-09-02T07:18:06-04:00
testsuite: Remove the 'all' metric argument of collect_stats
'all' gated bytes allocated, max_bytes_used and peak_megabytes_allocated
at a single tolerance, although their noise profiles are incompatible,
making such tests either flaky or toothless (#27653).
Closes #27653.
Assisted-by: Claude Fable 5
- - - - -
2228cb30 by Simon Jakobi at 2026-09-02T07:18:06-04:00
testsuite: Make the deviation argument of collect_stats mandatory
Almost every caller passes an explicit tolerance matched to the
metric's noise profile, and the silent 20% default is far slacker than
'bytes allocated' merits. Only two tests relied on it. They now state
their tolerance explicitly:
large-project gets 10%, in line with other large compile-time tests.
T9848 gets 2%: its metric is byte-for-byte deterministic across CI
jobs and platforms of a given test_env, has drifted only about 2.5%
since 2015, and the fusion failure it guards against would show up as
a roughly +30000% jump.
Assisted-by: Claude Fable 5
- - - - -
56291fc5 by Cheng Shao at 2026-09-02T07:18:45-04:00
autoconf/ghc-toolchain: bump llvm upper bound to support llvm 23
This commit bumps llvm upper bound to support llvm 23.
- - - - -
20eb3f41 by Cheng Shao at 2026-09-02T07:18:45-04:00
rts: fix compilation issues with clang 23
clang 23 has broadened `-Wall`/`-Wextra` ranges, exposing some minor
issues in the rts when building with validate flavours:
- Unused locals
- `#pragma GCC diagnostic pop` mismatch
This commit fixes those.
- - - - -
9e7739ab by Simon Jakobi at 2026-09-03T13:45:43-04:00
Add -Wimplicit-field-strictness (#16836)
This opt-in warning fires when a data constructor field lacks an
explicit strictness annotation (`!` or `~`). It complements the
LazyFieldAnnotations extension (4762a8bf30f) from GHC proposal 752,
which makes `~` annotations available for this purpose.
Deciding which fields to report requires their levity, so the check
runs after typechecking. To keep the noise down, the diagnostic is
emitted once per data declaration, grouped by constructor.
Closes #16836.
Assisted-by: Claude Fable 5
- - - - -
6a44d591 by mangoiv at 2026-09-03T13:46:22-04:00
simplifier: remove a bogus `assert` in `rebuild_app'` in `GHC.CoreToStg.Prep.cpeApp`.
Prior to this commit
commit 08bc245be70d95801bc1138804ed1de9474fbdc0
Author: sheaf <sam.derbyshire(a)gmail.com>
Date: Sat Feb 28 16:30:43 2026 +0100
Clean up join points, casts & ticks
This commit shores up the logic dealing with casts and ticks occurring
in between a join point binding and a jump
any `PlaceRuntime` ticks we observed were profiling ticks, even though that
isn't necessary.
The more liberal rules in the above commit allow e.g. breakpoint ticks
(which are valid PlaceRuntime ticks) to legitimately appear in an argument
position.
Fixes #27556
- - - - -
eaa95a6f by Andrei Borzenkov at 2026-09-04T08:08:40-04:00
Parentheses in prefix GADT constructors (#27423)
Updated `splitLHsGadtTy` to allow looking
through the parentheses for inner binders. General example
of a code pattern that's allowed now:
data S a where
MkS :: (forall a. S a)
That should work now with any combination of nested
foralls and parentheses.
We don't perform parenthesis unwrapping for record
GADT constructors in accordance with GHC Proposal #402.
To this end `con_inner_bndrs` no longer stores plain forall
telescopes: `[HsForAllTelescope pass]` is replaced with
`[LHsGadtTelescope pass]`, a new `HsArg`-style type whose
`HsGadtForAll` holds an inner telescope and whose `HsGadtPar`
holds a pair of parentheses. The parentheses carry no meaning
for renaming or type checking; the only reason to record them
is exact-printing.
Updated `pprConDecl` to improve the `parse == parse . ppr . parse`
property of GADT pretty-printing.
The pretty printer can now output code that's similar to this:
data T a where
MkT1 :: (forall a. T a)
MkT2 :: forall . forall a. T a
These are special cases of inner forall binders
for prefix GADT constructors, when we have either
implicit or zero explicit outer binders.
- - - - -
639456a8 by Evgeny Malyshev at 2026-09-04T08:09:25-04:00
HsPat: Add spacing to unary tuple patterns
Use hsep when printing unary boxed TuplePat applications so that the
MkSolo constructor is separated from its argument. The old hcat rendered
wildcard and parenthesized arguments as MkSolo_ and MkSolo().
Add T27034 to exercise the HsPat splice-dump path with wildcard and
variable arguments, and update existing affected golden output.
Fixes #27034
Assisted-By: OpenAI Codex
- - - - -
2908ab36 by Simon Jakobi at 2026-09-05T07:22:17-04:00
X86 NCG: use btr/bts/btc for single-bit operations
Previously the Cmm patterns
x & ~(1 << i)
x | (1 << i)
x ^ (1 << i)
compiled to mov/shl/not/and-style sequences of 3-4 instructions. Now
they compile to a single btr, bts or btc, matching what C compilers
produce.
When the bit index is a literal, constant folding has already collapsed
these patterns into ones with a literal mask, such as
x & 0xfffffeffffffffff for x & ~(1 << 40). Such masks are now also
compiled to a bit-test instruction when they don't fit in an imm32 and
would otherwise have to be loaded into a register first.
For a variable bit index, this applies only when the shift is unchecked
(uncheckedShiftL#, Data.Bits.unsafeShiftL): the bounds-checked shiftL
used by e.g. the default clearBit/setBit/complementBit implementations
wraps the shift in a bounds mask that this optimisation does not see
through. With a literal index, the bounds mask is constant-folded away,
so the checked operations benefit too.
See Note [Bit-test instructions] in GHC.CmmToAsm.X86.CodeGen.
Fixes #25233.
Assisted-by: Claude Fable 5
- - - - -
c673ecf0 by Simon Peyton Jones at 2026-09-05T07:22:59-04:00
Move HsStatic free-var test to typechecker
A `static` form should have no free *term* variables, but it
can have free *type* variables. Alas, the renamer does not really know what
is a term variable and what is a type variable, because of required type
arguments. This patch moves the test to the typechecker, which does know.
Addresses #27664
- - - - -
5939ceaf by sheaf at 2026-09-05T22:06:18-04:00
Windows: enforce path convention in ./configure
As detailed in Note [MSYS paths] in Hadrian.Utilities, the standing
convention (using Windows-style paths with forward slashes) is now
enforced in ./configure instead of within Hadrian, removing the need for
'cygpath' calls within Hadrian.
Fixes #26683
- - - - -
a6061455 by sheaf at 2026-09-05T22:06:18-04:00
Hadrian: introduce ExeSpawnPath
Specific details about the filepath used to specify the executable to
spawn with CreateProcess matters on Windows: whether we use forward or
backward slashes, a leading ./, or an absolute path changes how the
executable is found.
This commit introduces 'ExeSpawnPath' which is a path that is guaranteed
to be found when spawning a process. All command invocations now go
through this type to ensure the path has been properly sanitised.
See Note [NeedCurrentDirectoryForExePath] in Hadrian.Utilities.
The same treatment is applied to hsc2hs. Updates hsc2hs submodule.
- - - - -
e28313e3 by sheaf at 2026-09-05T22:07:06-04:00
Preserve tick ordering in 'tickTickedExpr'
'GHC.Core.Utils.tickTickedExpr' tries to combine a tick 't1' into an
existing stack of ticks 't2s'. There are two situations:
1. 't1' is subsumed by a tick in 't2s': drop it.
2. A tick in 't2s' is subsumed by 't1', say 't2'.
This commit ensures that in case (2) we keep 't1' on the outside instead
of replacing 't2' at its position in the stack. This avoids re-ordering
source notes (which was the cause of #27749).
This fixes a regression introduced in 2dadf3b0d05.
Fixes #27749
- - - - -
3172f557 by sheaf at 2026-09-05T22:07:06-04:00
Consistently prefer local source note ticks
GHC.Cmm.DebugBlock.cmmDebugGen (DWARF annotations) and
GHC.Stg.Debug.quickSourcePos (-finfo-table-map) both contained logic to
prioritise source note ticks from the current module.
This commit commons up this logic and propagates it to a third consumer:
IPE stack frames, in GHC.Driver.GenerateCgIPEStub.
See the new function GHC.Types.Tickish.bestSourceNote.
- - - - -
2ec723ed by Wolfgang Jeltsch at 2026-09-07T14:39:28+03:00
Add test for `base` being buildable with released GHCs
- - - - -
0e5f4012 by Wolfgang Jeltsch at 2026-09-07T14:39:28+03:00
Switch to GHC 9.14.2
- - - - -
49b87d22 by Wolfgang Jeltsch at 2026-09-07T14:39:29+03:00
Make .gitlab/base-ci.sh` executable
- - - - -
dd9253f2 by Wolfgang Jeltsch at 2026-09-07T14:39:29+03:00
Change the GHC version number back to 9.14.1
- - - - -
9ea8c0bb by Wolfgang Jeltsch at 2026-09-07T14:39:29+03:00
Enable error propagation in `.gitlab/base-ci.sh`
- - - - -
11e0db80 by Wolfgang Jeltsch at 2026-09-07T14:39:29+03:00
Remove the accidental restriction to exactly one GHC
- - - - -
0dbed5f0 by Wolfgang Jeltsch at 2026-09-07T14:39:29+03:00
Make relative directories absolute
- - - - -
ce781ee2 by Wolfgang Jeltsch at 2026-09-07T14:39:29+03:00
Make `${project_root}` available to all code
- - - - -
cf6407e8 by Wolfgang Jeltsch at 2026-09-07T14:39:29+03:00
Add missing newline escaping
- - - - -
75de3328 by Wolfgang Jeltsch at 2026-09-07T14:39:29+03:00
Fix the GHC installation path
- - - - -
ac6b815b by Wolfgang Jeltsch at 2026-09-07T14:39:29+03:00
Move the definition of `withEmptyCallStack` into `base`
- - - - -
ca1d32a2 by Wolfgang Jeltsch at 2026-09-07T14:39:29+03:00
Change tag `x86_64-windows` to `new-x86_64-windows`
- - - - -
d744e93b by Wolfgang Jeltsch at 2026-09-07T14:39:29+03:00
Change the actual installation procedure for Windows
- - - - -
b6183bd3 by Wolfgang Jeltsch at 2026-09-07T14:39:29+03:00
Switch to using a `Setup.hs` file
- - - - -
1250 changed files:
- .gitlab-ci.yml
- + .gitlab/base-ci.sh
- .gitlab/ci.sh
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- + changelog.d/27556
- + changelog.d/27626
- + changelog.d/27627
- + changelog.d/27703
- + changelog.d/27704
- + changelog.d/27717
- + changelog.d/T20363
- changelog.d/T27202
- + changelog.d/T27368-ppr-unreachable-cmm-blocks.md
- + changelog.d/T27440
- + changelog.d/T27557
- + changelog.d/T27583
- + changelog.d/T27586
- + changelog.d/T27589
- + changelog.d/T27639
- + changelog.d/T27657
- + changelog.d/T27705
- + changelog.d/T27722-cbe-entry-block.md
- + changelog.d/T27744
- + changelog.d/T27749
- + changelog.d/T27764
- + changelog.d/allow-gadt-prefix-con-parens
- + changelog.d/arm_ncg_fixes_T27430
- + changelog.d/downsweep-refactor
- changelog.d/fix-heap-census-large-arrays-19048
- + changelog.d/implicit-field-strictness-warning
- changelog.d/lazy-field-annotations
- + changelog.d/link-deterministic-order
- + changelog.d/llvm-23
- + changelog.d/ncg-x86-bit-test-instructions
- + changelog.d/refactor-known-names
- + changelog.d/rethrow-stm
- + changelog.d/show-byte-code
- changelog.d/unit-index
- compiler/GHC.hs
- + compiler/GHC/Builtin.hs
- + compiler/GHC/Builtin/KnownKeys.hs
- + compiler/GHC/Builtin/KnownOccs.hs
- + compiler/GHC/Builtin/Modules.hs
- − compiler/GHC/Builtin/Names.hs
- − compiler/GHC/Builtin/Names/TH.hs
- compiler/GHC/Builtin/PrimOps.hs
- compiler/GHC/Builtin/PrimOps/Casts.hs
- compiler/GHC/Builtin/PrimOps/Ids.hs
- + compiler/GHC/Builtin/TH.hs
- compiler/GHC/Builtin/Uniques.hs
- compiler/GHC/Builtin/Uniques.hs-boot
- − compiler/GHC/Builtin/Utils.hs
- + compiler/GHC/Builtin/WiredIn/Ids.hs
- compiler/GHC/Builtin/Types/Prim.hs → compiler/GHC/Builtin/WiredIn/Prim.hs
- compiler/GHC/Builtin/Types/Literals.hs → compiler/GHC/Builtin/WiredIn/TypeLits.hs
- compiler/GHC/Builtin/Types.hs → compiler/GHC/Builtin/WiredIn/Types.hs
- compiler/GHC/Builtin/Types.hs-boot → compiler/GHC/Builtin/WiredIn/Types.hs-boot
- compiler/GHC/ByteCode/Asm.hs
- compiler/GHC/ByteCode/Serialize.hs
- + compiler/GHC/ByteCode/Show.hs
- compiler/GHC/Cmm.hs
- compiler/GHC/Cmm/CommonBlockElim.hs
- compiler/GHC/Cmm/DebugBlock.hs
- compiler/GHC/Cmm/Expr.hs
- compiler/GHC/Cmm/Lint.hs
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Parser.y
- compiler/GHC/Cmm/Pipeline.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/Instr.hs
- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/CmmToAsm/Format.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
- compiler/GHC/CmmToAsm/X86/Ppr.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Class.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/FVs.hs
- compiler/GHC/Core/FamInstEnv.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Multiplicity.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/CprAnal.hs
- compiler/GHC/Core/Opt/DmdAnal.hs
- compiler/GHC/Core/Opt/LiberateCase.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/SetLevels.hs
- compiler/GHC/Core/Opt/Simplify/Env.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
- compiler/GHC/Core/Opt/SpecConstr.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Opt/WorkWrap/Utils.hs
- compiler/GHC/Core/Ppr.hs
- compiler/GHC/Core/Predicate.hs
- compiler/GHC/Core/Rules.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/Subst.hs
- compiler/GHC/Core/TyCo/FVs.hs
- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Unfold.hs
- compiler/GHC/Core/Unify.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToIface.hs
- compiler/GHC/CoreToStg.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/BooleanFormula.hs
- compiler/GHC/Data/Unboxed.hs
- compiler/GHC/Data/Word64Map/Internal.hs
- compiler/GHC/Data/Word64Map/Lazy.hs
- compiler/GHC/Data/Word64Map/Strict.hs
- compiler/GHC/Data/Word64Map/Strict/Internal.hs
- compiler/GHC/Driver/Backpack.hs
- compiler/GHC/Driver/Config/Tidy.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Env.hs
- compiler/GHC/Driver/Env/KnotVars.hs
- compiler/GHC/Driver/Env/Types.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/GenerateCgIPEStub.hs
- compiler/GHC/Driver/Main/Compile.hs
- compiler/GHC/Driver/Main/Hsc.hs
- compiler/GHC/Driver/Main/Passes.hs
- compiler/GHC/Driver/Make.hs
- compiler/GHC/Driver/MakeFile.hs
- compiler/GHC/Driver/Pipeline.hs
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Plugins.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Driver/Session/Units.hs
- compiler/GHC/Hs.hs
- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Decls/Overlap.hs
- compiler/GHC/Hs/Dump.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/ImpExp.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Lit.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Syn/Type.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Arrows.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Expr.hs
- compiler/GHC/HsToCore/Foreign/C.hs
- compiler/GHC/HsToCore/Foreign/Call.hs
- compiler/GHC/HsToCore/Foreign/JavaScript.hs
- compiler/GHC/HsToCore/Foreign/Utils.hs
- compiler/GHC/HsToCore/Foreign/Wasm.hs
- compiler/GHC/HsToCore/ListComp.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match.hs-boot
- compiler/GHC/HsToCore/Match/Constructor.hs
- compiler/GHC/HsToCore/Match/Literal.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc/Check.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Pmc/Ppr.hs
- compiler/GHC/HsToCore/Pmc/Solver.hs
- compiler/GHC/HsToCore/Pmc/Solver/Types.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/HsToCore/Types.hs
- compiler/GHC/HsToCore/Usage.hs
- compiler/GHC/HsToCore/Utils.hs
- compiler/GHC/Iface/Binary.hs
- compiler/GHC/Iface/Env.hs
- − compiler/GHC/Iface/Env.hs-boot
- compiler/GHC/Iface/Errors/Ppr.hs
- compiler/GHC/Iface/Errors/Types.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Ext/Types.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Make.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Tidy.hs
- compiler/GHC/Iface/Tidy/StaticPtrTable.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/Errors/Ppr.hs
- compiler/GHC/Parser/Header.hs
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Plugins.hs
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/HsType.hs
- compiler/GHC/Rename/Lit.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Rename/Names.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Rename/Splice.hs
- compiler/GHC/Rename/Unbound.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Runtime/Context.hs
- compiler/GHC/Runtime/Debugger.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Interpreter.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/Stg/BcPrep.hs
- compiler/GHC/Stg/Debug.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToCmm/Bind.hs
- compiler/GHC/StgToCmm/DataCon.hs
- compiler/GHC/StgToCmm/Env.hs
- compiler/GHC/StgToCmm/Foreign.hs
- compiler/GHC/StgToCmm/Lit.hs
- compiler/GHC/StgToCmm/Ticky.hs
- compiler/GHC/StgToJS/Apply.hs
- compiler/GHC/StgToJS/Arg.hs
- compiler/GHC/StgToJS/Expr.hs
- compiler/GHC/StgToJS/FFI.hs
- compiler/GHC/StgToJS/Linker/Utils.hs
- compiler/GHC/StgToJS/Utils.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Deriv/Functor.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Deriv/Generics.hs
- compiler/GHC/Tc/Deriv/Infer.hs
- compiler/GHC/Tc/Deriv/Utils.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Hole.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Arrow.hs
- compiler/GHC/Tc/Gen/Bind.hs
- compiler/GHC/Tc/Gen/Default.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Foreign.hs
- compiler/GHC/Tc/Gen/Head.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Match.hs
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/Gen/Sig.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Instance/Class.hs
- compiler/GHC/Tc/Instance/FunDeps.hs
- compiler/GHC/Tc/Instance/Typeable.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/Plugin.hs
- compiler/GHC/Tc/Solver.hs
- compiler/GHC/Tc/Solver/Default.hs
- compiler/GHC/Tc/Solver/Dict.hs
- compiler/GHC/Tc/Solver/FunDeps.hs
- compiler/GHC/Tc/Solver/InertSet.hs
- compiler/GHC/Tc/Solver/Monad.hs
- compiler/GHC/Tc/Solver/Rewrite.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/Build.hs
- compiler/GHC/Tc/TyCl/Class.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/Constraint.hs
- compiler/GHC/Tc/Types/Evidence.hs
- compiler/GHC/Tc/Types/LclEnv.hs
- compiler/GHC/Tc/Types/Origin.hs
- compiler/GHC/Tc/Utils/Backpack.hs
- compiler/GHC/Tc/Utils/Concrete.hs
- compiler/GHC/Tc/Utils/Env.hs
- compiler/GHC/Tc/Utils/Instantiate.hs
- compiler/GHC/Tc/Utils/Monad.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- compiler/GHC/Tc/Utils/TcType.hs
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Validity.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Types/Arity.hs
- compiler/GHC/Types/DefaultEnv.hs
- compiler/GHC/Types/Demand.hs
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/ForeignCall.hs
- compiler/GHC/Types/Hint.hs
- compiler/GHC/Types/Hint/Ppr.hs
- compiler/GHC/Types/Id/Info.hs
- compiler/GHC/Types/Id/Make.hs
- compiler/GHC/Types/InlinePragma.hs
- compiler/GHC/Types/Literal.hs
- compiler/GHC/Types/Name.hs
- compiler/GHC/Types/Name/Cache.hs
- compiler/GHC/Types/Name/Ppr.hs
- compiler/GHC/Types/Name/Reader.hs
- compiler/GHC/Types/RepType.hs
- compiler/GHC/Types/Tickish.hs
- compiler/GHC/Types/TyThing.hs
- compiler/GHC/Types/Unique.hs
- compiler/GHC/Types/Unique/DFM.hs
- compiler/GHC/Types/Unique/FM.hs
- + compiler/GHC/Types/UnresolvedImport.hs
- compiler/GHC/Types/Var.hs
- compiler/GHC/Unit.hs
- compiler/GHC/Unit/Env.hs
- compiler/GHC/Unit/External.hs
- compiler/GHC/Unit/External/Index.hs
- compiler/GHC/Unit/External/ModuleOrigin.hs
- compiler/GHC/Unit/External/Providers.hs
- compiler/GHC/Unit/Finder.hs
- compiler/GHC/Unit/Finder/Types.hs
- compiler/GHC/Unit/Module/Deps.hs
- compiler/GHC/Unit/Module/ModSummary.hs
- compiler/GHC/Unit/Module/Warnings.hs
- compiler/GHC/Unit/State.hs
- compiler/GHC/Unit/Types.hs
- compiler/GHC/Utils/Binary.hs
- − compiler/GHC/Utils/Binary/Typeable.hs
- compiler/Language/Haskell/Syntax/BooleanFormula.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- compiler/Language/Haskell/Syntax/Expr.hs
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/Type.hs
- compiler/ghc.cabal.in
- configure.ac
- docs/index.html.in
- docs/users_guide/debugging.rst
- docs/users_guide/exts/gadt_syntax.rst
- docs/users_guide/exts/qualified_strings.rst
- docs/users_guide/exts/strict.rst
- docs/users_guide/ghc_config.py.in
- docs/users_guide/separate_compilation.rst
- docs/users_guide/using-warnings.rst
- docs/users_guide/using.rst
- ghc/GHC/Driver/Session/Mode.hs
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Monad.hs
- ghc/Main.hs
- hadrian/README.md
- hadrian/doc/cross-compile.md
- hadrian/doc/flavours.md
- hadrian/doc/make.md
- hadrian/doc/windows.md
- hadrian/hadrian.cabal
- − hadrian/hie-bios
- hadrian/hie-bios.bat
- hadrian/src/Base.hs
- hadrian/src/Builder.hs
- hadrian/src/CommandLine.hs
- hadrian/src/Flavour.hs
- hadrian/src/Hadrian/Builder.hs
- hadrian/src/Hadrian/Builder/Ar.hs
- hadrian/src/Hadrian/Oracles/Path.hs
- hadrian/src/Hadrian/Utilities.hs
- hadrian/src/Oracles/Setting.hs
- hadrian/src/Oracles/TestSettings.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/Changelog.hs
- hadrian/src/Rules/Codes.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Rules/Lint.hs
- hadrian/src/Rules/Nofib.hs
- hadrian/src/Rules/Test.hs
- hadrian/src/Settings.hs
- − hadrian/src/Settings/Flavours/Quickest.hs
- hie.yaml
- libraries/base/base.cabal.in
- libraries/base/changelog.md
- libraries/base/src/Control/Applicative.hs
- libraries/base/src/Control/Concurrent.hs
- libraries/base/src/Control/Concurrent/Chan.hs
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- + testsuite/tests/th/TH_cvt_GadtNoCons.hs
- + testsuite/tests/th/TH_cvt_GadtNoCons.stderr
- + testsuite/tests/th/TH_cvt_IllegalDeclaration.hs
- + testsuite/tests/th/TH_cvt_IllegalDeclaration.stderr
- + testsuite/tests/th/TH_cvt_IllegalSumAlt.hs
- + testsuite/tests/th/TH_cvt_IllegalSumAlt.stderr
- + testsuite/tests/th/TH_cvt_InvalidCCallImpent.hs
- + testsuite/tests/th/TH_cvt_InvalidCCallImpent.stderr
- + testsuite/tests/th/TH_cvt_InvalidTyFamInstLHS.hs
- + testsuite/tests/th/TH_cvt_InvalidTyFamInstLHS.stderr
- + testsuite/tests/th/TH_cvt_InvalidTypeInstanceHeader.hs
- + testsuite/tests/th/TH_cvt_InvalidTypeInstanceHeader.stderr
- + testsuite/tests/th/TH_cvt_RecGadtNoCons.hs
- + testsuite/tests/th/TH_cvt_RecGadtNoCons.stderr
- + testsuite/tests/th/TH_cvt_SumAltArityExceeded.hs
- + testsuite/tests/th/TH_cvt_SumAltArityExceeded.stderr
- + testsuite/tests/th/TH_pragmaSpecOld.hs
- + testsuite/tests/th/TH_pragmaSpecOld.stderr
- testsuite/tests/th/all.T
- testsuite/tests/typecheck/should_compile/T13032.stderr
- testsuite/tests/typecheck/should_compile/T14273.stderr
- testsuite/tests/typecheck/should_compile/T18406b.stderr
- testsuite/tests/typecheck/should_compile/T18529.stderr
- + testsuite/tests/typecheck/should_compile/T27557.hs
- + testsuite/tests/typecheck/should_compile/T27664.hs
- testsuite/tests/typecheck/should_compile/all.T
- testsuite/tests/typecheck/should_compile/holes.stderr
- testsuite/tests/typecheck/should_compile/holes2.stderr
- testsuite/tests/typecheck/should_compile/holes3.stderr
- testsuite/tests/typecheck/should_compile/subsumption_sort_hole_fits.stderr
- testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr
- testsuite/tests/typecheck/should_fail/T12921.stderr
- testsuite/tests/typecheck/should_fail/T14884.stderr
- testsuite/tests/typecheck/should_fail/T15883b.stderr
- testsuite/tests/typecheck/should_fail/T15883c.stderr
- testsuite/tests/typecheck/should_fail/T15883d.stderr
- testsuite/tests/typecheck/should_fail/T21130.stderr
- testsuite/tests/typecheck/should_fail/T3323.stderr
- testsuite/tests/typecheck/should_fail/T5095.stderr
- testsuite/tests/typecheck/should_fail/T7279.stderr
- testsuite/tests/typecheck/should_fail/TcStaticPointersFail02.stderr
- testsuite/tests/typecheck/should_fail/TyAppPat_PatternBindingExistential.stderr
- testsuite/tests/typecheck/should_fail/tcfail072.stderr
- testsuite/tests/typecheck/should_fail/tcfail097.stderr
- testsuite/tests/typecheck/should_fail/tcfail133.stderr
- testsuite/tests/typecheck/should_run/T22510.stdout
- testsuite/tests/unboxedsums/UbxSumLevPoly.hs
- testsuite/tests/unboxedsums/unboxedsums_unit_tests.hs
- + testsuite/tests/vdq-rta/should_compile/T27583a.hs
- + testsuite/tests/vdq-rta/should_compile/T27583b.hs
- + testsuite/tests/vdq-rta/should_compile/T27583c.hs
- + testsuite/tests/vdq-rta/should_compile/T27583d.hs
- + testsuite/tests/vdq-rta/should_compile/T27583e.hs
- + testsuite/tests/vdq-rta/should_compile/T27583g.hs
- testsuite/tests/vdq-rta/should_compile/all.T
- + testsuite/tests/vdq-rta/should_fail/T27440e.hs
- + testsuite/tests/vdq-rta/should_fail/T27440e.stderr
- + testsuite/tests/vdq-rta/should_fail/T27583f.hs
- + testsuite/tests/vdq-rta/should_fail/T27583f.stderr
- + testsuite/tests/vdq-rta/should_fail/T27586a.hs
- + testsuite/tests/vdq-rta/should_fail/T27586a.stderr
- + testsuite/tests/vdq-rta/should_fail/T27586b.hs
- + testsuite/tests/vdq-rta/should_fail/T27586b.stderr
- + testsuite/tests/vdq-rta/should_fail/T27586c.hs
- + testsuite/tests/vdq-rta/should_fail/T27586c.stderr
- testsuite/tests/vdq-rta/should_fail/all.T
- testsuite/tests/warnings/should_compile/DerivingTypeable.stderr
- + testsuite/tests/warnings/should_compile/T16836a.hs
- + testsuite/tests/warnings/should_compile/T16836a.stderr
- + testsuite/tests/warnings/should_compile/T16836b.hs
- + testsuite/tests/warnings/should_compile/T16836c.hs
- + testsuite/tests/warnings/should_compile/T16836c.stderr
- + testsuite/tests/warnings/should_compile/T16836d.hs
- + testsuite/tests/warnings/should_compile/T16836d.stderr
- testsuite/tests/warnings/should_compile/all.T
- utils/check-exact/ExactPrint.hs
- utils/check-exact/Main.hs
- utils/check-exact/Parsers.hs
- utils/check-exact/Transform.hs
- utils/check-exact/Utils.hs
- utils/check-ppr/Main.hs
- utils/genprimopcode/Main.hs
- utils/ghc-toolchain/src/GHC/Toolchain/Program.hs
- utils/ghc-toolchain/src/GHC/Toolchain/Target.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
- utils/haddock/haddock-api/src/Haddock/Convert.hs
- utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
- utils/haddock/haddock-api/src/Haddock/Interface.hs
- utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
- utils/haddock/haddock-api/src/Haddock/Types.hs
- utils/hsc2hs
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/1440bf4cb944edb80ebc32a8135e09…
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[Git][ghc/ghc][wip/fendor/26610] Don't lose instances from shadowed imported modules with the same name
by Hannes Siebenhandl (＠fendor) 07 Sep '26
by Hannes Siebenhandl (＠fendor) 07 Sep '26
07 Sep '26
Hannes Siebenhandl pushed to branch wip/fendor/26610 at Glasgow Haskell Compiler / GHC
Commits:
0aed86e8 by fendor at 2026-09-07T13:22:25+02:00
Don't lose instances from shadowed imported modules with the same name
When we look for instances below the current module, we need to check
the unit id as well when we check for whether the module is the current
module, otherwise we ignore modules we import that have the same name as
the import module.
Adds regression test.
- - - - -
10 changed files:
- + changelog.d/26610
- compiler/GHC/Driver/Env.hs
- + testsuite/tests/ghci/prog-mhu008/Makefile
- + testsuite/tests/ghci/prog-mhu008/a/M.hs
- + testsuite/tests/ghci/prog-mhu008/all.T
- + testsuite/tests/ghci/prog-mhu008/b/M.hs
- + testsuite/tests/ghci/prog-mhu008/prog-mhu008.script
- + testsuite/tests/ghci/prog-mhu008/prog-mhu008.stdout
- + testsuite/tests/ghci/prog-mhu008/unitA
- + testsuite/tests/ghci/prog-mhu008/unitB
Changes:
=====================================
changelog.d/26610
=====================================
@@ -0,0 +1,7 @@
+section: compiler
+synopsis: Fix instance resolution for shadowed modules
+description:
+ Instances imported from modules with the same module name as the importing module
+ were dropped accidentally since we didn't account for the unit id of the imported module.
+mrs: !16648
+issues: #26610
=====================================
compiler/GHC/Driver/Env.hs
=====================================
@@ -263,13 +263,13 @@ hugCompleteSigsBelow hsc uid mn = foldr (++) [] <$>
-- | Find instances visible from the given set of imports
hugInstancesBelow :: HscEnv -> UnitId -> ModuleNameWithIsBoot -> IO (InstEnv, [FamInst])
hugInstancesBelow hsc_env uid mnwib = do
- let mn = gwib_mod mnwib
+ let mn = mkModule uid (gwib_mod mnwib)
(insts, famInsts) <-
unzip . concat <$>
hugSomeThingsBelowUs (\mod_info ->
let details = hm_details mod_info
-- Don't include instances for the current module
- in if moduleName (mi_module (hm_iface mod_info)) == mn
+ in if fmap toUnitId (mi_module (hm_iface mod_info)) == mn
then []
else [(md_insts details, md_fam_insts details)])
True -- Include -hi-boot
=====================================
testsuite/tests/ghci/prog-mhu008/Makefile
=====================================
@@ -0,0 +1,3 @@
+TOP=../../..
+include $(TOP)/mk/boilerplate.mk
+include $(TOP)/mk/test.mk
=====================================
testsuite/tests/ghci/prog-mhu008/a/M.hs
=====================================
@@ -0,0 +1,4 @@
+module M (T (..)) where
+
+newtype T = MkT Int
+ deriving (Eq, Ord)
=====================================
testsuite/tests/ghci/prog-mhu008/all.T
=====================================
@@ -0,0 +1,5 @@
+test('prog-mhu008',
+ [extra_files(['a/', 'b/', 'unitA', 'unitB']),
+ cmd_prefix('ghciWayFlags=' + config.ghci_way_flags),
+ req_interp],
+ ghci_multiunit_script, [['unitA', 'unitB'], 'prog-mhu008.script'])
=====================================
testsuite/tests/ghci/prog-mhu008/b/M.hs
=====================================
@@ -0,0 +1,11 @@
+{-# LANGUAGE PackageImports #-}
+
+module M
+ ( module Export
+ , cmp
+ ) where
+
+import "a" M as Export
+
+cmp :: T -> T -> Bool
+cmp x y = x <= y
=====================================
testsuite/tests/ghci/prog-mhu008/prog-mhu008.script
=====================================
@@ -0,0 +1,5 @@
+:set -XPackageImports
+import "a" M qualified as MA
+import "b" M qualified as MB
+
+MB.cmp (MA.MkT 1) (MA.MkT 2)
=====================================
testsuite/tests/ghci/prog-mhu008/prog-mhu008.stdout
=====================================
@@ -0,0 +1 @@
+True
=====================================
testsuite/tests/ghci/prog-mhu008/unitA
=====================================
@@ -0,0 +1,5 @@
+-this-unit-id a-0-inplace
+-this-package-name a
+-i
+-ia
+M
=====================================
testsuite/tests/ghci/prog-mhu008/unitB
=====================================
@@ -0,0 +1,6 @@
+-this-unit-id b-0-inplace
+-this-package-name b
+-package-id a-0-inplace
+-i
+-ib
+M
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/0aed86e8260009266448d2182e79113…
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[Git][ghc/ghc][wip/fendor/26610] Don't lose instances from shadowed imported modules with the same name
by Hannes Siebenhandl (＠fendor) 07 Sep '26
by Hannes Siebenhandl (＠fendor) 07 Sep '26
07 Sep '26
Hannes Siebenhandl pushed to branch wip/fendor/26610 at Glasgow Haskell Compiler / GHC
Commits:
d54a086f by fendor at 2026-09-07T12:56:53+02:00
Don't lose instances from shadowed imported modules with the same name
When we look for instances below the current module, we need to check
the unit id as well when we check for whether the module is the current
module, otherwise we ignore modules we import that have the same name as
the import module.
Adds regression test.
- - - - -
9 changed files:
- + changelog.d/26610
- compiler/GHC/Driver/Env.hs
- + testsuite/tests/ghci/prog-mhu008/Makefile
- + testsuite/tests/ghci/prog-mhu008/a/M.hs
- + testsuite/tests/ghci/prog-mhu008/all.T
- + testsuite/tests/ghci/prog-mhu008/b/M.hs
- + testsuite/tests/ghci/prog-mhu008/prog-mhu008.script
- + testsuite/tests/ghci/prog-mhu008/unitA
- + testsuite/tests/ghci/prog-mhu008/unitB
Changes:
=====================================
changelog.d/26610
=====================================
@@ -0,0 +1,7 @@
+section: compiler
+synopsis: Fix instance resolution for shadowed modules
+description:
+ Instances imported from modules with the same module name as the importing module
+ were dropped accidentally since we didn't account for the unit id of the imported module.
+mrs:
+issues: #26610
=====================================
compiler/GHC/Driver/Env.hs
=====================================
@@ -269,7 +269,8 @@ hugInstancesBelow hsc_env uid mnwib = do
hugSomeThingsBelowUs (\mod_info ->
let details = hm_details mod_info
-- Don't include instances for the current module
- in if moduleName (mi_module (hm_iface mod_info)) == mn
+ in if moduleUnitId (mi_module (hm_iface mod_info)) == uid
+ && moduleName (mi_module (hm_iface mod_info)) == mn
then []
else [(md_insts details, md_fam_insts details)])
True -- Include -hi-boot
=====================================
testsuite/tests/ghci/prog-mhu008/Makefile
=====================================
@@ -0,0 +1,3 @@
+TOP=../../..
+include $(TOP)/mk/boilerplate.mk
+include $(TOP)/mk/test.mk
=====================================
testsuite/tests/ghci/prog-mhu008/a/M.hs
=====================================
@@ -0,0 +1,4 @@
+module M (T (..)) where
+
+newtype T = MkT Int
+ deriving (Eq, Ord)
=====================================
testsuite/tests/ghci/prog-mhu008/all.T
=====================================
@@ -0,0 +1,5 @@
+test('prog-mhu008',
+ [extra_files(['a/', 'b/', 'unitA', 'unitB']),
+ cmd_prefix('ghciWayFlags=' + config.ghci_way_flags),
+ req_interp],
+ ghci_multiunit_script, [['unitA', 'unitB'], 'prog-mhu008.script'])
=====================================
testsuite/tests/ghci/prog-mhu008/b/M.hs
=====================================
@@ -0,0 +1,11 @@
+{-# LANGUAGE PackageImports #-}
+
+module M
+ ( module Export
+ , cmp
+ ) where
+
+import "a" M as Export
+
+cmp :: T -> T -> Bool
+cmp x y = x <= y
=====================================
testsuite/tests/ghci/prog-mhu008/prog-mhu008.script
=====================================
@@ -0,0 +1,5 @@
+:set -XPackageImports
+import "a" M qualified as MA
+import "b" M qualified as MB
+
+MB.cmp (MA.T 1) (MA.T 2)
=====================================
testsuite/tests/ghci/prog-mhu008/unitA
=====================================
@@ -0,0 +1,5 @@
+-this-unit-id a-0-inplace
+-this-package-name a
+-i
+-ia/src
+M
=====================================
testsuite/tests/ghci/prog-mhu008/unitB
=====================================
@@ -0,0 +1,6 @@
+-this-unit-id b-0-inplace
+-this-package-name b
+-package-id a-0-inplace
+-i
+-ib/src
+M
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07 Sep '26
Hannes Siebenhandl pushed new branch wip/fendor/26610 at Glasgow Haskell Compiler / GHC
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/fendor/26610
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[Git][ghc/ghc][wip/andrea/gbc-backport] 42 commits: rts/Interpreter: Factor out ctoi tuple info tables into data
by Andrea Vezzosi (＠trac-Saizan) 07 Sep '26
by Andrea Vezzosi (＠trac-Saizan) 07 Sep '26
07 Sep '26
Andrea Vezzosi pushed to branch wip/andrea/gbc-backport at Glasgow Haskell Compiler / GHC
Commits:
04a7f038 by Ben Gamari at 2026-09-07T10:33:38+02:00
rts/Interpreter: Factor out ctoi tuple info tables into data
Instead of a massive case let's put this into data which we can reuse
elsewhere.
(cherry picked from commit d2b89603425b6d08df199deb7b84cfdbd711869a)
- - - - -
d95b523b by Cheng Shao at 2026-09-07T10:33:39+02:00
compiler: only use `Name` instead of `Id` in `SptEntry`
As a part of #26298, this patch refactors `SptEntry` to only carry a
`Name` instead of `Id`: we do not care about extra information like
caffyness or type at all in any static pointer related codegen logic.
This is necessary to make `SptEntry` serializable, as a part of the
grand plan of serializable bytecode.
Co-authored-by: Codex <codex(a)openai.com>
(cherry picked from commit 39b2e3823da3ab168aa2b7365f0f27e01b1ecd0e)
- - - - -
b34b1928 by Oleg Grenrus at 2026-09-07T10:33:39+02:00
Generalise thNameToGhcName by adding HasHscEnv
There were multiple single monad-specific `getHscEnv` across codebase.
HasHscEnv is modelled on HasDynFlags.
My first idea was to simply add thNameToGhcNameHsc and
thNameToGhcNameTc, but those would been exactly the same
as thNameToGhcName already.
Also add an usage example to thNameToGhcName and mention that it's
recommended way of looking up names in GHC plugins
(cherry picked from commit eb2ab1e2cadde93c330330ca7fdc64b31cd61473)
- - - - -
c2809a36 by Simon Peyton Jones at 2026-09-07T10:33:39+02:00
Refactor ForAllCo
This is a pure refactor, addressing #26389.
It arranges that the kind coercion in a ForAllCo is a MCoercion, rather
than a plain Coercion, thus removing redundancy in the common case.
See (FC8) in Note [ForAllCo]
It's a nice cleanup.
(cherry picked from commit 94b62aa7e7b40b53442161a0c4f380955fda2f14)
- - - - -
4b45a5b6 by Cheng Shao at 2026-09-07T10:33:39+02:00
ghci: add :shell command
This patch adds a new :shell command to ghci which works similarly to
:!, except it guarantees to run the command via sh -c. On POSIX hosts
the behavior is identical to :!, but on Windows it uses the msys2
shell instead of system cmd.exe shell. This is convenient when writing
simple ghci scripts that run simple POSIX commands, and the behavior
can be expected to be coherent on both Windows and POSIX.
Co-authored-by: Codex <codex(a)openai.com>
(cherry picked from commit 06d2562362768051e4901878248cbad103e66e92)
- - - - -
c9b42a52 by Cheng Shao at 2026-09-07T10:33:39+02:00
testsuite: remove legacy :shell trick
This commit makes use of the built-in :shell functionality in ghci in
the test cases, and remove the legacy :shell trick.
(cherry picked from commit 186054f7e7a190ee175a6e93c6cfb63b8a67baca)
- - - - -
f46bd1a8 by Cheng Shao at 2026-09-07T10:33:39+02:00
docs: document :shell in ghci
This commit documents the :shell command in ghci.
Co-authored-by: Codex <codex(a)openai.com>
(cherry picked from commit 0a3a4aa30894820731e646e2788e9819b10a7d07)
- - - - -
b393fbd0 by Cheng Shao at 2026-09-07T10:33:47+02:00
compiler/ghci: replace the LoadDLL message with LoadDLLs
As a part of #25407, this commit changes the LoadDLL message to
LoadDLLs, which takes a list of DLL paths to load and returns the list
of remote pointer handles. The wasm dyld is refactored to take
advantage of LoadDLLs and harvest background parallelism. On other
platforms, LoadDLLs is based on a fallback codepath that does
sequential loading.
The driver is not actually emitting singular LoadDLLs message with
multiple DLLs yet, this is left in subsequent commits.
Co-authored-by: Codex <codex(a)openai.com>
(cherry picked from commit a4d664c78642438f0f178ffa243e2ffdbdf20397)
- - - - -
1df7c149 by Cheng Shao at 2026-09-07T10:33:51+02:00
driver: separate downsweep/upsweep phase in loadPackages'
This commit refactors GHC.Linker.Loader.loadPackages' to be separated
into downsweep/upsweep phases:
- The downsweep phase performs dependency analysis and generates a
list of topologically sorted packages to load
- The upsweep phase sequentially loads these packages by calling
loadPackage
This is a necessary refactoring to make it possible to make loading of
DLLs concurrent.
(cherry picked from commit c7fc4baeddcfad500126b2e91ce94d2b9391560d)
- - - - -
4a8f6881 by Cheng Shao at 2026-09-07T10:33:51+02:00
driver: emit single LoadDLLs message to load multiple DLLs
This commit refactors the driver so that it emits a single LoadDLLs
message to load multiple DLLs in GHC.Linker.Loader.loadPackages'.
Closes #25407.
-------------------------
Metric Increase:
MultiLayerModulesTH_OneShot
TcPlugin_RewritePerf
-------------------------
Co-authored-by: Codex <codex(a)openai.com>
(cherry picked from commit ab180104b61a930e8a1e906f013c151669ce6fff)
- - - - -
3c8e65c2 by Matthew Pickering at 2026-09-07T10:33:51+02:00
driver: Load bytecode static pointer entries during linking
Previously the entries were loaded too eagerly, during upsweep, but we
should delay loading them until we know that the relevant bytecode
object is demanded.
Towards #25230
(cherry picked from commit e9445c013fbccf9318739ca3d095a3e0a2e1be8a)
- - - - -
6f4e3d0a by Matthew Pickering at 2026-09-07T10:33:51+02:00
loader: Unify loadDecls and loadModuleLinkables functions
These two functions nearly did the same thing. I have refactored them so
that `loadDecls` now calls `loadModuleLinkables`.
Fixes #26459
(cherry picked from commit da9633a9009a08132b974b0407c4057cae3577f7)
- - - - -
a00635f2 by Matthew Pickering at 2026-09-07T10:33:51+02:00
testsuite: Use ghci_ways to set ways in PackedDataCon/UnboxedTuples/UnliftedDataTypeInterp tests
These tests reimplemented the logic from `valid_way` in order to
determine what ways to run. It's easier to use this combination of
`only_ways` and `extra_ways` to only run in GHCi ways and always run in
GHCi ways.
(cherry picked from commit 1275d3607299734228adbbc47bfb69bf8800279f)
- - - - -
81135a81 by Matthew Pickering at 2026-09-07T10:34:01+02:00
Rename interpreterBackend to bytecodeBackend
This is preparation for creating bytecode files.
The "interpreter" is one way in which we can run bytecode objects. It is
more accurate to describe that the backend produces bytecode, rather
than the means by which the code will eventually run.
The "interpreterBackend" binding is left as a deprecated alias.
(cherry picked from commit c06b534bbd6dbb570b760f2e82b3e375d3956bcf)
- - - - -
821cb346 by sheaf at 2026-09-07T10:34:03+02:00
Improvements to 'mayLookIdentical'
This commit makes significant improvements to the machinery that decides
when we should pretty-print the "invisible bits" of a type, such as:
- kind applications, e.g. '@k' in 'Proxy @k ty'
- RuntimeReps, e.g. 'TYPE r'
- multiplicities and linear arrows 'a %1 -> b'
To do this, this commit refactors 'mayLookIdentical' to return **which**
of the invisible bits don't match up, e.g. in
(a %1 -> b) ~ (a %Many -> b)
we find that the invisible bit that doesn't match up is a multiplicity,
so we should set 'sdocLinearTypes = True' when pretty-printing, and with
e.g.
Proxy @k1 ~ Proxy @k2
we find that the invisible bit that doesn't match up is an invisible
TyCon argument, so we set 'sdocPrintExplicitKinds = True'.
We leverage these changes to remove the ad-hoc treatment of linearity
of data constructors with 'dataConDisplayType' and 'dataConNonLinearType'.
This is now handled by the machinery of 'pprWithInvisibleBits'.
Fixes #26335 #26340
(cherry picked from commit 2b8baada761b13199b99268f243bebd009e6e1b5)
- - - - -
054abacb by sheaf at 2026-09-07T10:34:04+02:00
Store SDoc context in SourceError
This commits modifies the SourceError datatype which is used for
throwing and then reporting exceptions by storing all the info we need
to be able to print the SDoc, including whether we should print with
explicit kinds, explicit runtime-reps, etc.
This is done using the new datatype:
data SourceErrorContext
= SEC
!DiagOpts
!(DiagnosticOpts GhcMessage)
Now, when we come to report an error (by handling the exception), we
have access to the full context we need.
Fixes #26387
(cherry picked from commit 129ce32d3a4f2601f5c2d1bbaeeb2fbaf8dc9ef9)
- - - - -
52ad0d8f by Matthew Pickering at 2026-09-07T10:34:04+02:00
Add support for generating bytecode objects
This commit adds the `-fwrite-byte-code` option which makes GHC emit a
`.gbc` file which contains a serialised representation of bytecode.
The bytecode can be loaded by the compiler to avoid having to
reinterpret a module when using the bytecode interpreter (for example,
in GHCi).
There are also the new options:
* -gbcdir=<DIR>: Specify the directory to place the gbc files
* -gbcsuf=<suffix>: Specify the suffix for gbc files
The option `-fbyte-code-and-object-code` now implies
`-fwrite-byte-code`.
These performance tests fail due to https://github.com/haskell/directory/issues/204
-------------------------
Metric Increase:
MultiComponentModules
MultiLayerModules
MultiComponentModulesRecomp
MultiLayerModulesRecomp
MultiLayerModulesTH_Make
MultiLayerModulesTH_OneShot
T13701
-------------------------
The bytecode serialisation part was implemented by Cheng Shao
Co-authored-by: Cheng Shao <terrorjack(a)type.dance>
(cherry picked from commit 6bd8155c991cfce7cca594bc63ba8f6ca6751667)
- - - - -
5feab852 by Ben Gamari at 2026-09-07T10:34:04+02:00
rts: Eliminate uses of implicit constant arrays
Folding of `const`-sized variable-length arrays to a constant-length
array is a gnu extension which clang complains about.
Closes #26502.
(cherry picked from commit 0c00c9c3b4e9b8515d4839f2c1d7d771781dc6f4)
- - - - -
5701f672 by Cheng Shao at 2026-09-07T10:34:04+02:00
rts: use computed goto for instruction dispatch in the bytecode interpreter
This patch uses computed goto for instruction dispatch in the bytecode
interpreter. Previously instruction dispatch is done by a classic
switch loop, so executing the next instruction requires two jumps: one
to the start of the switch loop and another to the case block based on
the instruction tag. By using computed goto, we can build a jump table
consisted of code addresses indexed by the instruction tags
themselves, so executing the next instruction requires only one jump,
to the destination directly fetched from the jump table.
Closes #12953.
(cherry picked from commit 39567e85fa514c0c4dfeaf8faa586a47dd3e11ca)
- - - - -
cb3c6441 by Georgios Karachalias at 2026-09-07T10:34:04+02:00
Remove the `CoreBindings` constructor from `LinkablePart`
Adjust HscRecompStatus to disallow unhydrated WholeCoreBindings
from being passed as input to getLinkDeps (which would previously
panic in this case).
Fixes #26497
(cherry picked from commit b253013ebeea5273a1cc7bb0082ed952456af906)
- - - - -
fcf34e47 by Matthew Pickering at 2026-09-07T10:34:30+02:00
driver: Properly handle errors during LinkNode steps
Previously we were not properly catching errors during the LinkNode step
(see T9930fail test).
This is fixed by wrapping the `LinkNode` action in `wrapAction`, the
same handler which is used for module compilation.
Fixes #26496
(cherry picked from commit 6c91582f915f80daff774db7738094bda6ab3b44)
- - - - -
adc3aea7 by Sylvain Henry at 2026-09-07T10:34:38+02:00
Build external interpreter program on demand (#24731)
This patch teaches GHC how to build the external interpreter program
when it is missing. As long as we have the `ghci` library, doing this is
trivial so most of this patch is refactoring for doing it sanely.
(cherry picked from commit 55eab80d337e47decacbe979c29a1b7b47d0a872)
- - - - -
6babb4bf by Matthew Pickering at 2026-09-07T10:34:40+02:00
Use 'OsPath' in getModificationTimeIfExists
This part of the compiler is quite hot during recompilation checking in
particular since the filepaths will be translated to a string. It is
better to use the 'OsPath' native function, which turns out to be easy
to do.
(cherry picked from commit ef0dc33b2034fd91e11950751264e8b2e9f03fc4)
- - - - -
1fc4523a by Georgios Karachalias at 2026-09-07T10:34:40+02:00
Use OsPath in PkgDbRef and UnitDatabase, not FilePath
(cherry picked from commit fa3bd0a67eea13701d1b50053636f9645e999308)
- - - - -
81bc48c9 by Matthew Pickering at 2026-09-07T10:34:40+02:00
Add support for building bytecode libraries
A bytecode library is a collection of bytecode files (.gbc) and a
library which combines together additional object files.
A bytecode library is created by invoking GHC with the `-bytecodelib`
flag.
A library can be created from in-memory `ModuleByteCode` linkables or
by passing `.gbc` files as arguments on the command line.
Fixes #26298
(cherry picked from commit e36a5fcbeaa33abb17707173c9d1e81730f85008)
- - - - -
5c108aa0 by Matthew Pickering at 2026-09-07T10:34:40+02:00
Load bytecode libraries to satisfy package dependencies
This commit allows you to use a bytecode library to satisfy a package
dependency when using the interpreter.
If a user enables `-fprefer-byte-code`, then if a package provides a
bytecode library, that will be loaded and used to satisfy the
dependency.
The main change is to separate the relevant parts of the `LoaderState`
into external and home package byte code. Bytecode is loaded into either
the home package or external part (similar to HPT/EPS split), HPT
bytecode can be unloaded. External bytecode is never unloaded.
The unload function has also only been called with an empty list of
"stable linkables" for a long time. It has been modified to directly
implement a complete unloading of the home package bytecode linkables.
At the moment, the bytecode libraries are found in the "library-dirs"
field from the package description. In the future when `Cabal`
implements support for "bytecode-library-dirs" field, we can read the
bytecode libraries from there. No changes to the Cabal submodule are
necessary at the moment.
Four new tests are added in testsuite/tests/cabal, which generate fake
package descriptions and test loading the libraries into GHCi.
Fixes #26298
(cherry picked from commit 8f9ae3397dbcbb4b0bd7a574ffc6b1fbaa137b6c)
- - - - -
bd33325c by Hécate Kleidukos at 2026-09-07T10:34:50+02:00
driver: Hide source paths at verbosity level 1 by default
(cherry picked from commit aa9c5e2ca0d42f7361fc465d79f5beb056987a41)
- - - - -
85d0d6c5 by Matthew Pickering at 2026-09-07T10:34:52+02:00
determinism: Use a deterministic renaming when writing bytecode files
Now when writing the bytecode file, a counter and substitution are used
to provide deterministic keys to local variables (rather than relying on
uniques). This change ensures that `.gbc` are produced
deterministically.
Fixes #26499
(cherry picked from commit 9b64ad3a458bf4e4165f125059e4bc3d518c5834)
- - - - -
4df492f9 by Cheng Shao at 2026-09-07T10:34:55+02:00
compiler: implement string interning logic for BCONPtrFS
This patch adds a `FastStringEnv`-based cache of `MallocStrings`
requests to `Interp`, so that when we load bytecode with many
breakpoints that share the same module names & unit ids, we reuse the
allocated remote pointers instead of issuing duplicte `MallocStrings`
requests and bloating the C heap. Closes #26995.
(cherry picked from commit d054b4676298ea2189cd48fcf175676b97f559e7)
- - - - -
973932d5 by Cheng Shao at 2026-09-07T10:34:59+02:00
compiler: use `Binary` instance of `BCOByteArray` for bytecode objects
This commit defines `Binary` (from `compiler`) instance of
`BCOByteArray` which serializes the underlying buffer directly, and
uses it directly in bytecode object serialization. Previously we reuse
the `Binary` (from `binary`) instance, and this change allows us to
avoid double-copying via an intermediate `ByteString` when using
`put`/`get` in `binnary`. Also see added comment for explanation.
(cherry picked from commit fdf828aef8c78ae23ad058ed4696910b6beba232)
- - - - -
489c1b16 by Luite Stegeman at 2026-09-07T10:35:36+02:00
Support arbitrary size unboxed tuples in bytecode
This stores the size (number of words on the stack) of the next
expected tuple in the TSO, ctoi_spill_size field, eliminating
the need of stg_ctoi_tN frames for each size.
Note: On 32 bit platform there is still a bytecode tuple size
limit of 255 words on the stack.
Fixes #26946
(cherry picked from commit a85bd503a480cfa31f5afa09eb38f56c85c237de)
- - - - -
d72f0feb by Luite Stegeman at 2026-09-07T10:35:39+02:00
Add specialized frames for small tuples
Small tuples are now returned more efficiently to the interpreter.
They use one less word of stack space and don't need manipulation
of the TSO anymore.
(cherry picked from commit e2209031734770a51f04883e5b538b562449cba1)
- - - - -
54bf3fa2 by fendor at 2026-09-07T10:35:39+02:00
Extract Binary instances to `GHC.ByteCode.Binary`
(cherry picked from commit acffb1b1da1a59dbded9ec2dcb65e495aee31f40)
- - - - -
8c416273 by fendor at 2026-09-07T10:35:39+02:00
Add `seqNonEmpty` for evaluating `NonEmpty a`
(cherry picked from commit e2ea8e25c5128afa8191669c751942348ab3043b)
- - - - -
b15172fb by fendor at 2026-09-07T10:36:48+02:00
Record `LinkableUsage` instead of `Linkable` in `LoaderState`
Retaining a ByteCode `Linkable` after it has been loaded retains its
`UnlinkedBCO`, keeping it alive for the remainder of the program.
This starts accumulating a lot of `UnlinkedBCO` and memory over time.
However, the `Linkable` is merely used to later record its usage in
`mkObjectUsage`, which is used for recompilation checking.
However, this is incorrect, as the interface file and bytecode objects
could be in different states, e.g. the interface changes, but the
bytecode library hasn't changed so we don't need to recompile and vice
versa.
By computing a `Fingerprint` for the `ModuleByteCode`, and recording it
in the `LinkableUsage`, we know precisely whether the `ByteCode` object
on disk is outdated.
Thus, parts of this commit just makes sure that we efficiently compute a
`Fingerprint` for `ModuleByteCode` and store it in the on-disk
representation of `ModuleByteCode`.
We change the `LoaderState` to retain `LinkableUsage`, which is smaller
representation of a `Linkable`. This allows us to free the unneeded
fields of `Linkable` after linking them.
We declare the following memory invariants that this commit implements:
* No `LinkablePart` should be retained from `LoaderState`.
* `Linkable`s should be unloaded after they have been loaded.
These invariants are unfortunately tricky to automatically uphold, so we
are simply documenting our assumptions for now.
We introduce the `linkable-space` test which makes sure that after
loading, no `DotGBC` or `UnlinkedBCO` is retained.
-------------------------
Metric Increase:
MultiLayerModulesTH_OneShot
-------------------------
We allocate a bit more, but the peak number of bytes doesn't change.
While a bit unfortunate, accepting the metric increase.
We add multiple new performance measurements where we were able to
observe the desired memory invariants. Further, we add regression tests
to validate that the recompilation checker behaves more correct than
before.
(cherry picked from commit 048b00b7c231dec199a4441caac279f3bbcd75f4)
- - - - -
63d606ed by Matthew Pickering at 2026-09-07T10:36:50+02:00
bytecode: Add magic header/version to bytecode files
In order to avoid confusing errors when using stale interface files (ie
from an older compiler version), we add a simple header/version check
like the one for interface files.
Fixes #27068
(cherry picked from commit 5cbc2c823fb0710c37f6e9144382dd59e0353782)
- - - - -
1148c794 by fendor at 2026-09-07T10:36:50+02:00
Add constants for bytecode in-memory buffer size
Introduce a common constant for the default size of the .gbc and
.bytecodelib binary buffer.
The buffer is by default set to 1 MB.
(cherry picked from commit d95a19366f64e6d866c8df0b1ab917884cc015dc)
- - - - -
76e7aaeb by mangoiv at 2026-09-07T10:36:50+02:00
testsuite: filter stderr for static001 on darwin
This reactivates the test on x86_64 darwin as this should have been done
long ago and ignores warnings emitted by ranlib on newer version of the
darwin toolchain since they are benign. (no symbols for stub libraries)
Fixes #27116
(cherry picked from commit b822c30aa6c0bf008c06c5bd4ee86313c40f652d)
- - - - -
0ca318c0 by Cheng Shao at 2026-09-07T10:36:56+02:00
ghci: use ShortByteString for LookupSymbol/LookupSymbolInDLL/LookupClosure messages
This patch refactors ghci to use `ShortByteString` for
`LookupSymbol`/`LookupSymbolInDLL`/`LookupClosure` messages as the
first part of #27147.
Co-authored-by: Codex <codex(a)openai.com>
(cherry picked from commit 8dd6f453348e467686bd222551c89ecc466d36f0)
- - - - -
9fab7193 by Cheng Shao at 2026-09-07T10:36:58+02:00
ghci: use ShortByteString for MkCostCentres message
This patch refactors ghci to use `ShortByteString` for `MkCostCentres`
messages as a first part of #27147. This also considerably lowers the
memory overhead of breakpoints when cost center profiling is enabled.
-------------------------
Metric Decrease:
interpreter_steplocal
-------------------------
Co-authored-by: Codex <codex(a)openai.com>
(cherry picked from commit 371ef200bcb2664c4511daca75f72a52c1473950)
- - - - -
931f3536 by fendor at 2026-09-07T10:36:58+02:00
Expose startupHpc as an rts symbol
(cherry picked from commit f3485446d8c90aa39ee633606b488253ae23a255)
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43251415 by fendor at 2026-09-07T10:42:06+02:00
Make HPC work with bytecode interpreter
Add support to generate .tix files from bytecode objects and the
bytecode interpreter.
Conceptually, we insert HPC ticks into the bytecode similar to how we insert
breakpoints.
HPC and breakpoints do not share the same tick array but we use a separate
tick-array for hpc/breakpoint ticks during bytecode generation.
We teach the bytecode interpreter to handle hpc ticks.
The implementation is quite trivial, simply increment the counter in the
global hpc_ticks array for the respective module.
This hpc_ticks array is generated as part of the `CStub`, so we can rely
on it existing.
A tricky bit is "registering" a bytecode object for HPC instrumentation.
In the compiled case, this is achieved via CStub and initializer/finalizers
`.init` sections which are called when the executable is run.
After the initializers have been invoked, which is before `hs_init_ghc`,
we then call `startup_hpc` in `hs_init_ghc` iff any modules were "registered"
for hpc instrumentation via `hs_hpc_module`.
Since bytecode objects are loaded after starting up GHCi, this workflow
doesn't work for supporting `hpc` and the `hpc` run-time is never
started, even if a module is added for instrumentation.
We fix this issue by employing the same technique as is for `SptEntry`s:
* We introduce a new field to `CompiledByteCode`, called `ByteCodeHpcInfo`
which contains enough information to call `hs_hpc_module`, allowing us to
register the module for `hpc` instrumentation`.
* After registering the module, we unconditionally call `startupHpc`, to make
sure the .tix file is written.
Calling `startupHpc` multiple times is safe.
Calling `hs_hpc_module` multiple times for the same module is also safe.
If we didn't register the hpc module in this way, evaluating a bytecode object
instrumented with `-fhpc` without registering it in the `hpc` run-time will
simply not generate any `.tix` files for this bytecode object.
However, this shouldn't happen if everything is set up correctly.
Closes #27036
(cherry picked from commit 28f07d702a1b47230122df22e84b60fda49897c5)
- - - - -
388 changed files:
- + changelog.d/bytecode-interpreter-hpc-support
- compiler/GHC.hs
- compiler/GHC/Builtin/PrimOps.hs
- compiler/GHC/ByteCode/Asm.hs
- + compiler/GHC/ByteCode/Binary.hs
- compiler/GHC/ByteCode/Breakpoints.hs
- compiler/GHC/ByteCode/Instr.hs
- compiler/GHC/ByteCode/Linker.hs
- + compiler/GHC/ByteCode/Recomp/Binary.hs
- + compiler/GHC/ByteCode/Serialize.hs
- compiler/GHC/ByteCode/Types.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/Coercion.hs-boot
- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Multiplicity.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/Monad.hs
- compiler/GHC/Core/Reduction.hs
- compiler/GHC/Core/TyCo/Compare.hs
- compiler/GHC/Core/TyCo/FVs.hs
- compiler/GHC/Core/TyCo/Ppr.hs
- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/TyCo/Tidy.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Unify.hs
- compiler/GHC/CoreToIface.hs
- compiler/GHC/Data/FlatBag.hs
- compiler/GHC/Data/OsPath.hs
- compiler/GHC/Data/SmallArray.hs
- compiler/GHC/Driver/Backend.hs
- compiler/GHC/Driver/Backend/Internal.hs
- compiler/GHC/Driver/Backpack.hs
- + compiler/GHC/Driver/ByteCode.hs
- compiler/GHC/Driver/CodeOutput.hs
- compiler/GHC/Driver/Config/Finder.hs
- + compiler/GHC/Driver/Config/Interpreter.hs
- compiler/GHC/Driver/Config/Linker.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Env.hs
- compiler/GHC/Driver/Env/Types.hs
- compiler/GHC/Driver/Errors.hs
- compiler/GHC/Driver/Errors/Ppr.hs
- compiler/GHC/Driver/Errors/Types.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/Hooks.hs
- compiler/GHC/Driver/Main.hs
- compiler/GHC/Driver/Make.hs
- compiler/GHC/Driver/MakeFile.hs
- compiler/GHC/Driver/Messager.hs
- compiler/GHC/Driver/Monad.hs
- compiler/GHC/Driver/Phases.hs
- compiler/GHC/Driver/Pipeline.hs
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Plugins.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Breakpoints.hs
- compiler/GHC/HsToCore/Coverage.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/HsToCore/Usage.hs
- compiler/GHC/Iface/Decl.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Make.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Recomp/Types.hs
- compiler/GHC/Iface/Rename.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Tidy.hs
- compiler/GHC/Iface/Tidy/StaticPtrTable.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/IfaceToCore.hs
- + compiler/GHC/Linker/ByteCode.hs
- compiler/GHC/Linker/Config.hs
- compiler/GHC/Linker/Deps.hs
- compiler/GHC/Linker/Dynamic.hs
- + compiler/GHC/Linker/Executable.hs
- − compiler/GHC/Linker/ExtraObj.hs
- compiler/GHC/Linker/Loader.hs
- compiler/GHC/Linker/MacOS.hs
- compiler/GHC/Linker/Static.hs
- compiler/GHC/Linker/Types.hs
- compiler/GHC/Linker/Windows.hs
- compiler/GHC/Parser/Header.hs
- compiler/GHC/Plugins.hs
- compiler/GHC/Runtime/Debugger.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Interpreter.hs
- + compiler/GHC/Runtime/Interpreter/C.hs
- + compiler/GHC/Runtime/Interpreter/Init.hs
- compiler/GHC/Runtime/Interpreter/Types.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/Settings.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToJS/StaticPtr.hs
- compiler/GHC/SysTools/Tasks.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/Solver/Equality.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/CtLoc.hs
- compiler/GHC/Tc/Types/Origin.hs
- compiler/GHC/Tc/Utils/Monad.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- compiler/GHC/Tc/Utils/TcType.hs
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Utils/Unify.hs-boot
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/HpcInfo.hs
- compiler/GHC/Types/Id/Make.hs
- compiler/GHC/Types/SourceError.hs
- compiler/GHC/Types/SptEntry.hs
- compiler/GHC/Types/Tickish.hs
- compiler/GHC/Types/TyThing/Ppr.hs
- compiler/GHC/Unit/Finder.hs
- compiler/GHC/Unit/Finder/Types.hs
- compiler/GHC/Unit/Home/ModInfo.hs
- compiler/GHC/Unit/Home/PackageTable.hs
- compiler/GHC/Unit/Info.hs
- compiler/GHC/Unit/Module/Deps.hs
- compiler/GHC/Unit/Module/Graph.hs
- compiler/GHC/Unit/Module/Location.hs
- compiler/GHC/Unit/Module/ModGuts.hs
- compiler/GHC/Unit/Module/ModSummary.hs
- compiler/GHC/Unit/Module/Status.hs
- compiler/GHC/Unit/Module/WholeCoreBindings.hs
- compiler/GHC/Unit/State.hs
- compiler/GHC/Utils/Binary.hs
- compiler/GHC/Utils/Error.hs
- compiler/GHC/Utils/Misc.hs
- compiler/GHC/Utils/Outputable.hs
- compiler/ghc.cabal.in
- docs/users_guide/extending_ghc.rst
- docs/users_guide/ghci.rst
- docs/users_guide/phases.rst
- docs/users_guide/separate_compilation.rst
- ghc/GHCi/Leak.hs
- ghc/GHCi/UI.hs
- ghc/Main.hs
- hadrian/src/Settings/Builders/RunTest.hs
- libraries/ghc-boot/GHC/Unit/Database.hs
- + libraries/ghci/GHCi/Coverage.hs
- libraries/ghci/GHCi/Message.hs
- libraries/ghci/GHCi/ObjLink.hs
- libraries/ghci/GHCi/Run.hs
- libraries/ghci/ghci.cabal.in
- rts/Apply.cmm
- rts/Continuation.c
- rts/ContinuationOps.cmm
- rts/Disassembler.c
- rts/Hpc.c
- rts/Interpreter.c
- rts/Printer.c
- rts/RaiseAsync.c
- rts/RtsSymbols.c
- rts/Schedule.c
- rts/StgMiscClosures.cmm
- rts/Threads.c
- rts/Threads.h
- rts/include/rts/Bytecodes.h
- rts/include/rts/storage/TSO.h
- rts/include/stg/MiscClosures.h
- rts/posix/OSMem.c
- testsuite/config/ghc
- testsuite/driver/testglobals.py
- testsuite/driver/testlib.py
- testsuite/mk/boilerplate.mk
- testsuite/mk/test.mk
- testsuite/tests/backpack/cabal/bkpcabal08/bkpcabal08.stdout
- testsuite/tests/bytecode/T24634/T24634a.stdout
- testsuite/tests/bytecode/T24634/T24634b.stdout
- + testsuite/tests/bytecode/TLinkable/BCOTemplate.hs
- + testsuite/tests/bytecode/TLinkable/LinkableUsage01.stderr
- + testsuite/tests/bytecode/TLinkable/LinkableUsage02.stderr
- + testsuite/tests/bytecode/TLinkable/Makefile
- + testsuite/tests/bytecode/TLinkable/all.T
- + testsuite/tests/bytecode/TLinkable/genLinkables.sh
- + testsuite/tests/bytecode/TLinkable/linkable-space.hs
- + testsuite/tests/bytecode/TLinkable/linkable-space.stdout
- + testsuite/tests/bytecode/tuplestress/ByteCode.hs
- + testsuite/tests/bytecode/tuplestress/Common.hs-incl
- + testsuite/tests/bytecode/tuplestress/Obj.hs
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- + testsuite/tests/bytecode/tuplestress/all.T
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- testsuite/tests/cabal/Makefile
- testsuite/tests/cabal/all.T
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- testsuite/tests/cabal/ghcpkg03.stderr-mingw32
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- testsuite/tests/driver/T20030/test2/all.T
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- testsuite/tests/driver/T20030/test5/all.T
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- testsuite/tests/driver/T5313.hs
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- testsuite/tests/driver/linkwhole/Main.hs
- testsuite/tests/driver/multipleHomeUnits/all.T
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- testsuite/tests/ghc-api/T10942.hs
- testsuite/tests/ghc-api/T8639_api.hs
- testsuite/tests/ghc-api/annotations-literals/literals.hs
- testsuite/tests/ghc-api/apirecomp001/myghc.hs
- testsuite/tests/ghc-e/should_fail/T9930fail.stderr
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- testsuite/tests/ghci.debugger/scripts/break022/all.T
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- testsuite/tests/ghci.debugger/scripts/break023/all.T
- testsuite/tests/ghci.debugger/scripts/break023/break023.script
- − testsuite/tests/ghci/linking/T11531.stderr
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- testsuite/tests/ghci/prog005/prog005.T
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- testsuite/tests/ghci/prog010/ghci.prog010.script
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- testsuite/tests/ghci/should_run/UnliftedDataTypeInterp/unlifteddatatypeinterp.T
- testsuite/tests/hpc/Makefile
- testsuite/tests/hpc/T17073.stdout → testsuite/tests/hpc/T17073a.stdout
- + testsuite/tests/hpc/T17073b.stdout
- testsuite/tests/hpc/T20568.stdout → testsuite/tests/hpc/T20568a.stdout
- + testsuite/tests/hpc/T20568b.stdout
- testsuite/tests/hpc/all.T
- testsuite/tests/hpc/fork/Makefile
- testsuite/tests/hpc/function/Makefile
- testsuite/tests/hpc/function/test.T
- + testsuite/tests/hpc/function/tough1.stderr
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- testsuite/tests/hpc/function2/test.T
- + testsuite/tests/hpc/function2/tough3.script
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- testsuite/tests/hpc/ghc_ghci/Makefile
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- + testsuite/tests/hpc/ghc_ghci/hpc_ghci01.stdout
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- testsuite/tests/hpc/simple/Makefile
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- + testsuite/tests/hpc/simple/hpc003.hs
- + testsuite/tests/hpc/simple/hpc003.script
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- testsuite/tests/hpc/simple/test.T
- testsuite/tests/indexed-types/should_fail/T14887.stderr
- testsuite/tests/linear/should_fail/T19361.stderr
- testsuite/tests/perf/compiler/Makefile
- testsuite/tests/perf/compiler/MultiLayerModulesDefsGhci.script
- + testsuite/tests/perf/compiler/MultiLayerModulesDefsGhciWithBytecodeFiles.script
- testsuite/tests/perf/compiler/all.T
- testsuite/tests/roles/should_compile/Roles13.stderr
- testsuite/tests/rts/KeepCafsMain.hs
- testsuite/tests/rts/T13676.script
- testsuite/tests/rts/linker/T2615.hs
- testsuite/tests/simplCore/should_compile/OpaqueNoCastWW.stderr
- testsuite/tests/simplCore/should_compile/T17673.stderr
- testsuite/tests/simplCore/should_compile/T18078.stderr
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- testsuite/tests/simplCore/should_compile/T19890.stderr
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- testsuite/tests/simplCore/should_compile/T24808.stderr
- − testsuite/tests/simplCore/should_compile/T25713.stderr
- testsuite/tests/simplCore/should_compile/T4201.stdout
- testsuite/tests/simplCore/should_compile/T8331.stderr
- testsuite/tests/simplStg/should_compile/T22840.stderr
- testsuite/tests/typecheck/no_skolem_info/T20232.stderr
- testsuite/tests/typecheck/should_fail/T11672.stderr
- testsuite/tests/typecheck/should_fail/T12373.stderr
- testsuite/tests/typecheck/should_fail/T15807.stderr
- testsuite/tests/typecheck/should_fail/T16074.stderr
- testsuite/tests/typecheck/should_fail/T18357a.stderr
- testsuite/tests/typecheck/should_fail/T19627.stderr
- testsuite/tests/typecheck/should_fail/T21530a.stderr
- testsuite/tests/typecheck/should_fail/VisFlag1.stderr
- utils/check-exact/Parsers.hs
- utils/check-exact/Preprocess.hs
- utils/deriveConstants/Main.hs
- utils/ghc-pkg/Main.hs
- utils/iserv/iserv.cabal.in
- utils/jsffi/dyld.mjs
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/76f85708089b426b0044a19f0841c1…
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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 6 commits: Windows: enforce path convention in ./configure
by Marge Bot (＠marge-bot) 07 Sep '26
by Marge Bot (＠marge-bot) 07 Sep '26
07 Sep '26
Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC
Commits:
5939ceaf by sheaf at 2026-09-05T22:06:18-04:00
Windows: enforce path convention in ./configure
As detailed in Note [MSYS paths] in Hadrian.Utilities, the standing
convention (using Windows-style paths with forward slashes) is now
enforced in ./configure instead of within Hadrian, removing the need for
'cygpath' calls within Hadrian.
Fixes #26683
- - - - -
a6061455 by sheaf at 2026-09-05T22:06:18-04:00
Hadrian: introduce ExeSpawnPath
Specific details about the filepath used to specify the executable to
spawn with CreateProcess matters on Windows: whether we use forward or
backward slashes, a leading ./, or an absolute path changes how the
executable is found.
This commit introduces 'ExeSpawnPath' which is a path that is guaranteed
to be found when spawning a process. All command invocations now go
through this type to ensure the path has been properly sanitised.
See Note [NeedCurrentDirectoryForExePath] in Hadrian.Utilities.
The same treatment is applied to hsc2hs. Updates hsc2hs submodule.
- - - - -
e28313e3 by sheaf at 2026-09-05T22:07:06-04:00
Preserve tick ordering in 'tickTickedExpr'
'GHC.Core.Utils.tickTickedExpr' tries to combine a tick 't1' into an
existing stack of ticks 't2s'. There are two situations:
1. 't1' is subsumed by a tick in 't2s': drop it.
2. A tick in 't2s' is subsumed by 't1', say 't2'.
This commit ensures that in case (2) we keep 't1' on the outside instead
of replacing 't2' at its position in the stack. This avoids re-ordering
source notes (which was the cause of #27749).
This fixes a regression introduced in 2dadf3b0d05.
Fixes #27749
- - - - -
3172f557 by sheaf at 2026-09-05T22:07:06-04:00
Consistently prefer local source note ticks
GHC.Cmm.DebugBlock.cmmDebugGen (DWARF annotations) and
GHC.Stg.Debug.quickSourcePos (-finfo-table-map) both contained logic to
prioritise source note ticks from the current module.
This commit commons up this logic and propagates it to a third consumer:
IPE stack frames, in GHC.Driver.GenerateCgIPEStub.
See the new function GHC.Types.Tickish.bestSourceNote.
- - - - -
551d91d0 by Luite Stegeman at 2026-09-07T02:21:36-04:00
rts: fix ctoi_tuple_spill_words getting out of sync
Fix a few places that were not updating ctoi_tuple_spill_words
correctly, leading to corruption/crashes when dealing with large
unboxed tuples in bytecode:
- captureContinuationAndAbort
- findRetryFrameHelper/findAtomicallyFrameHelper
- interpretBCO bci_BRK_FUN
fixes #27633
- - - - -
d7402a33 by Simon Jakobi at 2026-09-07T02:21:37-04:00
Hadrian: don't capture the testsuite driver's output (#27780)
a6061455d54 switched the Testsuite RunTest case from Shake's cmd to the
cmd' wrapper. cmd' always captures stdout and stderr, and since the
caller asks for Exit, it returns without dumping what it captured. As a
result the testsuite output no longer appears in CI job logs: failures,
performance metrics and the summary were lost with the job.
Use cmdExe, the uncaptured cmd, as the other plain-cmd sites in that
commit do.
Fixes #27780.
Assisted-by: Claude Fable 5.1
- - - - -
49 changed files:
- + changelog.d/T27749
- compiler/GHC/Cmm/DebugBlock.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/Driver/GenerateCgIPEStub.hs
- compiler/GHC/Driver/Main/Compile.hs
- compiler/GHC/Stg/Debug.hs
- compiler/GHC/Types/Tickish.hs
- configure.ac
- hadrian/src/Base.hs
- hadrian/src/Builder.hs
- hadrian/src/Hadrian/Builder.hs
- hadrian/src/Hadrian/Builder/Ar.hs
- hadrian/src/Hadrian/Oracles/Path.hs
- hadrian/src/Hadrian/Utilities.hs
- hadrian/src/Oracles/Setting.hs
- hadrian/src/Oracles/TestSettings.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/Changelog.hs
- hadrian/src/Rules/Codes.hs
- hadrian/src/Rules/Lint.hs
- hadrian/src/Rules/Nofib.hs
- hadrian/src/Rules/Test.hs
- m4/find_python.m4
- + m4/fp_canonicalise_win_path.m4
- m4/fp_find_nm.m4
- m4/fp_find_root.m4
- m4/fp_prog_ar.m4
- m4/fp_prog_ar_args.m4
- m4/fp_prog_sh.m4
- m4/fptools_alex.m4
- m4/fptools_happy.m4
- rts/Continuation.c
- rts/Interpreter.c
- rts/Schedule.c
- + testsuite/tests/bytecode/T27633/Obj.hs
- + testsuite/tests/bytecode/T27633/T27633a.hs
- + testsuite/tests/bytecode/T27633/T27633a.stdout
- + testsuite/tests/bytecode/T27633/T27633b.hs
- + testsuite/tests/bytecode/T27633/T27633b.stdout
- + testsuite/tests/bytecode/T27633/all.T
- + testsuite/tests/ghci.debugger/scripts/T27633c.hs
- + testsuite/tests/ghci.debugger/scripts/T27633c.script
- + testsuite/tests/ghci.debugger/scripts/T27633c.stdout
- + testsuite/tests/ghci.debugger/scripts/T27633c_obj.hs
- testsuite/tests/ghci.debugger/scripts/all.T
- + testsuite/tests/simplCore/should_compile/T27749.hs
- + testsuite/tests/simplCore/should_compile/T27749.stderr
- testsuite/tests/simplCore/should_compile/all.T
- utils/hsc2hs
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/dd0ec867942b0ab464bbeaff8dff66…
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[Git][ghc/ghc] Pushed new branch wip/sjakobi/T27780-testsuite-output
by Simon Jakobi (＠sjakobi) 07 Sep '26
by Simon Jakobi (＠sjakobi) 07 Sep '26
07 Sep '26
Simon Jakobi pushed new branch wip/sjakobi/T27780-testsuite-output at Glasgow Haskell Compiler / GHC
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[Git][ghc/ghc][wip/rafl/hpc-instances] 10 commits: Windows: enforce path convention in ./configure
by Florian Ragwitz (＠rafl) 06 Sep '26
by Florian Ragwitz (＠rafl) 06 Sep '26
06 Sep '26
Florian Ragwitz pushed to branch wip/rafl/hpc-instances at Glasgow Haskell Compiler / GHC
Commits:
5939ceaf by sheaf at 2026-09-05T22:06:18-04:00
Windows: enforce path convention in ./configure
As detailed in Note [MSYS paths] in Hadrian.Utilities, the standing
convention (using Windows-style paths with forward slashes) is now
enforced in ./configure instead of within Hadrian, removing the need for
'cygpath' calls within Hadrian.
Fixes #26683
- - - - -
a6061455 by sheaf at 2026-09-05T22:06:18-04:00
Hadrian: introduce ExeSpawnPath
Specific details about the filepath used to specify the executable to
spawn with CreateProcess matters on Windows: whether we use forward or
backward slashes, a leading ./, or an absolute path changes how the
executable is found.
This commit introduces 'ExeSpawnPath' which is a path that is guaranteed
to be found when spawning a process. All command invocations now go
through this type to ensure the path has been properly sanitised.
See Note [NeedCurrentDirectoryForExePath] in Hadrian.Utilities.
The same treatment is applied to hsc2hs. Updates hsc2hs submodule.
- - - - -
e28313e3 by sheaf at 2026-09-05T22:07:06-04:00
Preserve tick ordering in 'tickTickedExpr'
'GHC.Core.Utils.tickTickedExpr' tries to combine a tick 't1' into an
existing stack of ticks 't2s'. There are two situations:
1. 't1' is subsumed by a tick in 't2s': drop it.
2. A tick in 't2s' is subsumed by 't1', say 't2'.
This commit ensures that in case (2) we keep 't1' on the outside instead
of replacing 't2' at its position in the stack. This avoids re-ordering
source notes (which was the cause of #27749).
This fixes a regression introduced in 2dadf3b0d05.
Fixes #27749
- - - - -
3172f557 by sheaf at 2026-09-05T22:07:06-04:00
Consistently prefer local source note ticks
GHC.Cmm.DebugBlock.cmmDebugGen (DWARF annotations) and
GHC.Stg.Debug.quickSourcePos (-finfo-table-map) both contained logic to
prioritise source note ticks from the current module.
This commit commons up this logic and propagates it to a third consumer:
IPE stack frames, in GHC.Driver.GenerateCgIPEStub.
See the new function GHC.Types.Tickish.bestSourceNote.
- - - - -
ba9bc217 by Florian Ragwitz at 2026-09-06T14:56:07-07:00
hpc: Test desired HPC behaviour for class instances
- - - - -
717ad6bc by Florian Ragwitz at 2026-09-06T14:56:07-07:00
Extend TcGblEnv with a mapping from instance method Ids to DFunIds
We want to use this in HPC to provide better support for instance methods.
This is working towards #17155.
- - - - -
54ba2b25 by Florian Ragwitz at 2026-09-06T14:56:07-07:00
hpc: Do not create top-level boxes for generated instance methods
Users care about which of their written methods are or aren't covered, not
whether all of the inherited methods are covered as well. Those should be
covered where they are implemented.
We achieve that by stopping to generate top-level boxes which will often appear
as uncovered with no clear indication as to why, and no way to fix other than
excercising code the user has not written.
Fixes #17155.
- - - - -
e53b7d7f by Florian Ragwitz at 2026-09-06T14:56:07-07:00
hpc: Provide coverage information for class instances
After fixing #17155, we no longer create top-level boxes for the source spans
of instance heads (previously that was the source span used for
inherited/generated instance methods).
With those boxes gone, we can introduce a new top-level box for each class
instance with that instance head source span, and provide more meaningful
coverage semantics for it.
We make the use of any of the instance's methods (user-written or generated)
tick this box, providing the programmer with useful information about whether
or not the instance was exercised at run-time, and whether the instance might
be unnecessary.
- - - - -
c03ac031 by Florian Ragwitz at 2026-09-06T14:56:07-07:00
hpc: Don't allocate boxes for methodless classes
With the plumbing we currently have, these could never be covered, which is not
helpful to hpc users. This could be improved upon further.
- - - - -
56d01e69 by Florian Ragwitz at 2026-09-06T14:56:07-07:00
Add a changelog entry for new HPC features
- - - - -
45 changed files:
- + changelog.d/T27749
- + changelog.d/hpc-classinsts
- compiler/GHC/Cmm/DebugBlock.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/Driver/GenerateCgIPEStub.hs
- compiler/GHC/Driver/Main/Compile.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/Stg/Debug.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Utils/Monad.hs
- compiler/GHC/Types/Tickish.hs
- configure.ac
- hadrian/src/Base.hs
- hadrian/src/Builder.hs
- hadrian/src/Hadrian/Builder.hs
- hadrian/src/Hadrian/Builder/Ar.hs
- hadrian/src/Hadrian/Oracles/Path.hs
- hadrian/src/Hadrian/Utilities.hs
- hadrian/src/Oracles/Setting.hs
- hadrian/src/Oracles/TestSettings.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/Changelog.hs
- hadrian/src/Rules/Codes.hs
- hadrian/src/Rules/Lint.hs
- hadrian/src/Rules/Nofib.hs
- hadrian/src/Rules/Test.hs
- m4/find_python.m4
- + m4/fp_canonicalise_win_path.m4
- m4/fp_find_nm.m4
- m4/fp_find_root.m4
- m4/fp_prog_ar.m4
- m4/fp_prog_ar_args.m4
- m4/fp_prog_sh.m4
- m4/fptools_alex.m4
- m4/fptools_happy.m4
- + testsuite/tests/hpc/instmeths/instmeths.hs
- + testsuite/tests/hpc/instmeths/instmeths.stdout
- + testsuite/tests/hpc/instmeths/test.T
- + testsuite/tests/simplCore/should_compile/T27749.hs
- + testsuite/tests/simplCore/should_compile/T27749.stderr
- testsuite/tests/simplCore/should_compile/all.T
- utils/hsc2hs
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/6317c95a9aed544c3506d43ada669a…
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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/6317c95a9aed544c3506d43ada669a…
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